Planting calendar for Boise, Idaho

Dates from 30 years of records at the Boise Air Terminal weather station, 3.7 miles from Boise, worked out crop by crop with the same method as the Year Round Garden app.

Boise at a glance

Weather station: Boise Air Terminal · 3.7 mi
USDA zone: 7a
Last spring frost: typically Apr 24; 1 year in 10 after May 9
First fall frost: typically Oct 21; 1 year in 10 before Oct 5
Frost-free season: about 180 days
Hottest month: July: highs 93°F, nights 62°F
Coldest month: December: highs 39°F, nights 25°F
Rain: 12 in. a year, most in January, May and December

What shapes the seasons here

The last spring frost in Boise typically comes around Apr 24, but 1 year in 10 it comes after May 9. The first fall frost typically arrives around Oct 21. That leaves about 180 frost-free days for tender crops like tomatoes, peppers and squash.

Summer highs average 93°F in July. Lettuce, spinach and cilantro bolt in heat like this, so they're best planted Mar 27–Apr 20, Aug 13–Sep 3.

Boise gets about 12 inches of rain a year, most of it in January, May and December.

145 of the 174 crops in the app grow here; 29 need a different climate (listed near the bottom).

When to plant the most popular crops

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Tomato (slicing)

Tomato (cherry & grape)

Pepper (sweet / bell)

Pepper (hot / chili)

Eggplant

Cucumber (slicing)

Summer squash & zucchini

Watermelon

Bean (bush snap)

Sweet corn

Okra

Potato

Pea (snap & snow)

Lettuce (leaf & mesclun)

Spinach

Kale

Collard greens

Broccoli

Cabbage

Carrot

Radish

Onion (bulbing)

Garlic

Basil

Cilantro

Strawberry

Best Can plant Start indoors

Get these dates as reminders for your exact yard

The free Year Round Garden app uses the weather station nearest your own address, not just the city. It reminds you when to start seeds, plant and harvest, sends frost and storm alerts from the National Weather Service, and keeps a garden journal. No account needed, in English and Spanish.

Download on the App Store Free for up to 5 plants on iPhone and Android.

What to plant in Boise, month by month

January0

Too cold to plant outdoors. Plan beds, order seeds and start the ones listed indoors.

Start seeds indoors

Celeriac (celery root), Leek, Onion (bulbing), Pansy / viola, Snapdragon

February0

Too cold to plant outdoors. Plan beds, order seeds and start the ones listed indoors.

Start seeds indoors

Artichoke, Broccoli, Brussels sprouts, Cabbage, Cardoon, Cauliflower, Celery, Catnip, Lovage, Parsley, Purple coneflower (echinacea), Statice, Stock

March15

Best time to plant

Vegetables: Arugula, Cabbage, Fava bean, Kale, Mustard greens, Onion (bulbing), Pea (shelling / English), Pea (snap & snow), Radish, Shallot, Spinach

Fruit: Blackberry

Flowers: Larkspur, Pansy / viola, Sweet pea (flower)

Start seeds indoors

Celeriac (celery root), Celery, Lettuce (romaine & head), Onion (bulbing), Pepper (sweet / bell), Tomato (early / short-season), Catnip, Feverfew, Lavender, Lemon balm, Lovage, Rosemary, Sage, Winter savory, Strawflower

April63

Best time to plant

Vegetables: Artichoke, Arugula, Asparagus, Beet, Bok choy / pak choi, Broccoli, Broccoli raab (rapini), Cardoon, Carrot, Cauliflower, Celeriac (celery root), Chickpea / garbanzo, Chinese broccoli (gai lan), Collard greens, Daikon radish, Fennel (bulb), Garden cress, Green onion / scallion, Kohlrabi, Leek, Lettuce (leaf & mesclun), Lettuce (romaine & head), Mustard greens, Napa / Chinese cabbage, Onion (bulbing), Parsnip, Potato, Radish, Rhubarb, Salsify, Sunchoke (Jerusalem artichoke), Swiss chard, Turnip, Watercress

Herbs: Borage, Caraway, Catnip, Chamomile, Chervil, Dill, Feverfew, Lemon balm, Lovage, Mint, Parsley, Sage, Sorrel (French / garden), Tarragon (French), Winter savory

Fruit: Blackberry, Fig, Grape (bunch), Raspberry, Strawberry

Flowers: Bachelor's button (cornflower), Calendula, California poppy, Coreopsis (tickseed), Purple coneflower (echinacea), Statice, Stock, Sweet alyssum, Sweet pea (flower)

Can also plant

Cabbage, Kale, Pea (shelling / English), Pea (snap & snow), Radicchio, Shallot, Spinach, Cilantro, Pansy / viola

Start seeds indoors

Celeriac (celery root), Celery, Eggplant, Leek, Onion (bulbing), Pepper (hot / chili), Pepper (sweet / bell), Tomatillo, Tomato (cherry & grape), Tomato (heat-set varieties), Tomato (paste / determinate), Tomato (slicing), Anise hyssop, Bee balm (bergamot), Chives, Garlic chives, Marjoram, Oregano, Shiso (perilla), Thyme, Cucamelon / mouse melon, Ground cherry, Annual salvia

May35

Best time to plant

Vegetables: Armenian cucumber, Bean (bush snap), Bean (dry / shelling), Bean (pole), Bitter melon, Cardoon, Celery, Cucumber (pickling), Cucumber (slicing), New Zealand spinach, Pepper (sweet / bell), Popcorn, Pumpkin, Salsify, Summer squash & zucchini, Sunchoke (Jerusalem artichoke), Sweet corn, Tomatillo, Tomato (cherry & grape), Tomato (early / short-season), Tomato (paste / determinate), Tomato (slicing), Winter squash

Herbs: Borage, Epazote, Lovage, Shiso (perilla), Summer savory, Tarragon (French), Winter savory

Fruit: Cucamelon / mouse melon, Ground cherry

Flowers: Purple coneflower (echinacea), Statice, Strawflower

Can also plant

Arugula, Asparagus, Beet, Carrot, Celeriac (celery root), Chinese broccoli (gai lan), Collard greens, Garden cress, Green onion / scallion, Kale, Kohlrabi, Komatsuna (mustard spinach), Leek, Onion (bulbing), Potato, Radish, Shallot, Swiss chard, Turnip, Watercress, Anise hyssop, Bee balm (bergamot), Catnip, Chamomile, Chives, Dill, Fenugreek (methi), Feverfew, Garlic chives, Lavender, Lemon balm, Lemon verbena, Marjoram, Mint, Oregano, Parsley, Rosemary, Sage, Sorrel (French / garden), Thyme, Vietnamese coriander (rau ram), Blackberry, Fig, Strawberry, Annual salvia, Black-eyed Susan, Calendula, Cleome (spider flower), Marigold, Milkweed (native), Nasturtium, Sunflower, Sweet alyssum

Start seeds indoors

Eggplant, Leek, Malabar spinach, Pepper (sweet / bell), Tomato (cherry & grape), Tomato (heat-set varieties), Tomato (paste / determinate), Tomato (slicing), Basil, Parsley, Annual salvia, Globe amaranth (gomphrena), Marigold, Milkweed (native), Pentas (Egyptian star cluster), Statice

June43

Best time to plant

Vegetables: Amaranth greens / callaloo, Bean (dry / shelling), Bean (lima), Celeriac (celery root), Celery, Edamame, Eggplant, Onion (bulbing), Pepper (hot / chili), Pepper (sweet / bell), Potato, Pumpkin, Purslane, Salsify, Sweet corn, Tomato (heat-set varieties), Tomato (slicing), Winter squash

Herbs: Anise hyssop, Basil, Bee balm (bergamot), Chives, Garlic chives, Lavender, Lemon verbena, Marjoram, Oregano, Papalo, Rosemary, Stevia, Thyme, Vietnamese coriander (rau ram)

Fruit: Cantaloupe & melons, Watermelon

Flowers: Annual salvia, Black-eyed Susan, Cleome (spider flower), Cosmos, Globe amaranth (gomphrena), Marigold, Milkweed (native), Sunflower, Zinnia

Can also plant

Armenian cucumber, Bean (bush snap), Bean (pole), Bitter melon, Brussels sprouts, Cabbage, Carrot, Chinese broccoli (gai lan), Collard greens, Cucumber (pickling), Cucumber (slicing), Leek, New Zealand spinach, Popcorn, Shallot, Summer squash & zucchini, Swiss chard, Tomatillo, Tomato (cherry & grape), Tomato (early / short-season), Tomato (paste / determinate), Borage, Caraway, Chamomile, Cuban oregano, Epazote, Feverfew, Parsley, Sage, Shiso (perilla), Summer savory, Tarragon (French), Winter savory, Cucamelon / mouse melon, Fig, Ground cherry, Purple coneflower (echinacea), Statice, Strawflower

Start seeds indoors

Broccoli, Cabbage, Tomato (cherry & grape), Tomato (early / short-season), Basil, Marigold, Pansy / viola, Stock, Strawflower

July47

Best time to plant

Vegetables: Armenian cucumber, Bean (bush snap), Bean (lima), Bean (pole), Bitter melon, Cabbage, Carrot, Cucumber (pickling), Cucumber (slicing), Edamame, Eggplant, Leek, Malabar spinach, Napa / Chinese cabbage, New Zealand spinach, Okinawa spinach, Okra, Onion (bulbing), Pepper (sweet / bell), Purslane, Shallot, Summer squash & zucchini, Sweet corn, Tomato (cherry & grape), Tomato (early / short-season), Tomato (heat-set varieties), Tomato (paste / determinate), Tomato (slicing)

Herbs: Basil, Borage, Caraway, Cuban oregano, Epazote, Parsley, Vietnamese coriander (rau ram)

Flowers: Annual salvia, Black-eyed Susan, Cleome (spider flower), Cosmos, Globe amaranth (gomphrena), Marigold, Nasturtium, Pentas (Egyptian star cluster), Statice, Strawflower, Sunflower, Zinnia

Can also plant

Amaranth greens / callaloo, Arugula, Beet, Chinese broccoli (gai lan), Collard greens, Kale, Kohlrabi, Komatsuna (mustard spinach), Lettuce (leaf & mesclun), Swiss chard, Tomatillo, Turnip, Chamomile, Dill, Fenugreek (methi), Papalo, Shiso (perilla), Summer savory, Cucamelon / mouse melon, Ground cherry, Calendula, Sweet alyssum

Start seeds indoors

Lettuce (romaine & head)

August33

Best time to plant

Vegetables: Amaranth greens / callaloo, Arugula, Beet, Broccoli, Broccoli raab (rapini), Carrot, Chinese broccoli (gai lan), Collard greens, Daikon radish, Kale, Kohlrabi, Komatsuna (mustard spinach), Lettuce (leaf & mesclun), Lettuce (romaine & head), Mustard greens, Napa / Chinese cabbage, Pea (shelling / English), Pea (snap & snow), Swiss chard, Turnip

Herbs: Borage, Chamomile, Chervil, Cilantro, Dill, Epazote, Fenugreek (methi)

Flowers: Calendula, Nasturtium, Pansy / viola, Stock, Strawflower, Sweet alyssum

Can also plant

Garden cress, Radish, Spinach, Annual salvia, Bachelor's button (cornflower), California poppy

September8

Best time to plant

Vegetables: Arugula, Garden cress, Kale, Mache (corn salad), Mustard greens, Radish, Spinach

Flowers: Pansy / viola

October2

Best time to plant

Vegetables: Elephant garlic, Garlic

November0

Too cold to plant outdoors. A good month to plan beds and order seeds.

December0

Too cold to plant outdoors. A good month to plan beds and order seeds.

Every crop that grows in Boise

145 of 174 crops in the app fit this climate. Dates are for planting outdoors; “Start indoors” is for seeds you grow into transplants.

Vegetables

Crop	Best time to plant	Also possible	Start indoors	How
Amaranth greens / callaloo	Jun 10–24, Aug 3–16	Jun 25–Aug 2	—	Sow seeds
Armenian cucumber	May 18–Jun 1, Jul 2–22	Jun 2–Jul 1	—	Sow seeds
Artichoke	Apr 10–24	—	Feb 6–20	Set out plants
Arugula	Mar 13–Apr 17, Aug 22–Sep 13	Apr 18–May 14, Jul 22–Aug 21	—	Sow seeds
Asparagus	Mar 27–Apr 24	Apr 25–May 22	—	Set out plants
Bean (bush snap)	May 18–Jun 1, Jul 16–Aug 6	Jun 2–Jul 15	—	Sow seeds
Bean (dry / shelling)	May 18–Jun 1, Jun 11–Jul 2	Jun 2–10	—	Sow seeds
Bean (lima)	Jun 10–Jul 7	—	—	Sow seeds
Bean (pole)	May 18–Jun 1, Jul 6–27	Jun 2–Jul 5	—	Sow seeds
Beet	Mar 27–Apr 17, Aug 1–22	Apr 18–May 18, Jun 28–Jul 31	—	Sow seeds
Bitter melon	May 18–Jun 1, Jul 4–25	Jun 2–Jul 3	—	Sow seeds
Bok choy / pak choi	Apr 10–20	—	—	Sow seeds
Broccoli	Mar 27–Apr 10, Jul 31–Aug 14	Apr 11–May 1	Feb 13–27, Jun 19–Jul 3	Set out plants
Broccoli raab (rapini)	Mar 27–Apr 14, Aug 19–Sep 1	Apr 15–28, Jul 31–Aug 18	—	Sow seeds
Brussels sprouts	Mar 27–Apr 4	Jun 3–Jul 3	Feb 13–21	Set out plants
Cabbage	Mar 20–Apr 3, Jul 12–Aug 2	Apr 4–May 2, Jun 21–Jul 11	Feb 6–20, May 31–Jun 21	Set out plants
Cardoon	Apr 24–May 8	May 9–Jun 8	Feb 20–Mar 6	Set out plants
Carrot	Apr 3–24, Jul 22–Aug 12	Apr 25–May 11, Jun 19–Jul 21	—	Sow seeds
Cauliflower	Apr 3–17	Apr 18–May 6	Feb 20–Mar 6	Set out plants
Celeriac (celery root)	Apr 10–24, Jun 7–28	Apr 25–Jun 6	Jan 23–Feb 6, Mar 22–Apr 12	Set out plants
Celery	Apr 27–May 11, Jun 3–24	May 12–Jun 2	Feb 9–23, Mar 18–Apr 8	Set out plants
Chickpea / garbanzo	Apr 7–21	Apr 22–28	—	Sow seeds
Chinese broccoli (gai lan)	Apr 3–24, Jul 30–Aug 19	Apr 25–May 21, Jun 15–Jul 29	—	Sow seeds
Collard greens	Mar 27–Apr 10, Aug 5–26	Apr 11–Aug 4	—	Sow seeds
Cucumber (pickling)	May 18–Jun 1, Jul 9–30	Jun 2–Jul 8	—	Sow seeds
Cucumber (slicing)	May 18–Jun 1, Jul 7–27	Jun 2–Jul 6	—	Sow seeds
Daikon radish	Apr 3–17, Aug 11–22	Apr 18–May 1	—	Sow seeds
Edamame	Jun 10–Jul 9	—	—	Sow seeds
Eggplant	Jun 10–Jul 12	—	Apr 8–May 10	Set out plants
Elephant garlic	Sep 30–Nov 4	—	—	Sow seeds
Fava bean	Mar 13–22	—	—	Sow seeds
Fennel (bulb)	Apr 10–22	—	—	Sow seeds
Garden cress	Apr 10–May 5, Aug 28–Sep 17	May 6–30, Aug 7–27	—	Sow seeds
Garlic	Sep 30–Nov 4	—	—	Sow seeds
Green onion / scallion	Mar 27–Apr 10	Apr 11–May 22	—	Sow seeds
Kale	Mar 13–Apr 3, Aug 18–Sep 7	Apr 4–May 18, Jun 26–Aug 17	—	Sow seeds
Kohlrabi	Mar 27–Apr 10, Aug 9–29	Apr 11–May 21, Jul 13–Aug 8	—	Sow seeds
Komatsuna (mustard spinach)	Jul 30–Sep 6	Apr 24–May 11, Jul 1–29	—	Sow seeds
Leek	Mar 27–Apr 10, Jun 26–Jul 17	Apr 11–17, May 9–Jun 25	Jan 23–Feb 6, Apr 24–May 15	Set out plants
Lettuce (leaf & mesclun)	Mar 27–Apr 20, Aug 13–Sep 3	Apr 21–May 6, Jul 14–Aug 12	—	Sow seeds
Lettuce (romaine & head)	Apr 3–19, Jul 31–Aug 17	—	Feb 27–Mar 15, Jun 26–Jul 13	Set out plants
Mache (corn salad)	Sep 2–15	Mar 27–Apr 4, Aug 25–Sep 1	—	Sow seeds
Malabar spinach	Jun 30–Jul 9	—	May 12–21	Set out plants
Mustard greens	Mar 13–Apr 11, Aug 25–Sep 11	Apr 12–May 4, Jul 31–Aug 24	—	Sow seeds
Napa / Chinese cabbage	Apr 10–22, Jun 29–Aug 12	—	—	Sow seeds
New Zealand spinach	May 18–Jun 1, Jul 9–29	Jun 2–Jul 8	—	Sow seeds
Okinawa spinach	Jun 30–Jul 14	—	—	Set out plants
Okra	Jun 30–Jul 15	—	—	Sow seeds
Onion (bulbing)	Mar 13–Apr 9, Jun 7–Jul 7	Apr 10–Jun 6, Jul 8	Mar 22–Apr 21, Dec 26–Jan 22	Set out plants
Parsnip	Apr 3–16	—	—	Sow seeds
Pea (shelling / English)	Mar 13–27, Jul 31–Aug 19	Mar 28–May 6	—	Sow seeds
Pea (snap & snow)	Mar 13–27, Jul 31–Aug 19	Mar 28–May 4	—	Sow seeds
Pepper (hot / chili)	May 28–Jun 11, Jun 14–Jul 5	—	Mar 26–Apr 9, Apr 12–May 3	Set out plants
Pepper (sweet / bell)	May 18–Jun 1, Jun 24–Jul 15	Jun 2–23	Mar 16–30, Apr 22–May 13	Set out plants
Popcorn	May 18–25	May 26–Jun 19	—	Sow seeds
Potato	Apr 2–22, Jun 6–Jul 4	Mar 27–Apr 1, Apr 23–Jun 5	—	Sow seeds
Pumpkin	May 18–Jun 10	—	—	Sow seeds
Purslane	Jun 10–24, Jul 15–Aug 5	Jun 25–Jul 14	—	Sow seeds
Radicchio	Mar 27–Apr 3	Apr 4–15	—	Sow seeds
Radish	Mar 21–Apr 24, Aug 31–Sep 25	Mar 20, Apr 25–May 27, Aug 5–30	—	Sow seeds
Rhubarb	Mar 27–Apr 11	Apr 12–27	—	Set out plants
Salsify	Apr 3–24, May 18–Jun 8	Apr 25–May 17	—	Sow seeds
Shallot	Mar 13–27, Jul 1–22	Mar 28–Jun 30	—	Sow seeds
Spinach	Mar 13–Apr 2, Aug 31–Sep 20	Apr 3–24, Aug 11–30	—	Sow seeds
Summer squash & zucchini	May 18–Jun 1, Jul 12–Aug 1	Jun 2–Jul 11	—	Sow seeds
Sunchoke (Jerusalem artichoke)	Apr 23–May 12	Apr 3–22, May 13–15	—	Sow seeds
Sweet corn	May 18–25, Jun 24–Jul 14	May 26–Jun 23	—	Sow seeds
Swiss chard	Apr 3–24, Aug 6–27	Apr 25–Aug 5	—	Sow seeds
Tomatillo	May 18–Jun 1	Jun 2–Jul 12	Apr 6–20	Set out plants
Tomato (cherry & grape)	May 18–Jun 1, Jul 9–29	Jun 2–Jul 8	Mar 30–Apr 13, May 21–Jun 10	Set out plants
Tomato (early / short-season)	May 1–8, Jul 14–Aug 3	May 9–Jul 13	Mar 13–20, May 26–Jun 15	Set out plants
Tomato (heat-set varieties)	Jun 10–24, Jun 26–Jul 17	—	Apr 22–May 6, May 8–29	Set out plants
Tomato (paste / determinate)	May 18–Jun 1, Jun 26–Jul 17	Jun 2–25	Mar 30–Apr 13, May 8–29	Set out plants
Tomato (slicing)	May 18–Jun 1, Jun 24–Jul 14	Jun 2–23	Mar 30–Apr 13, May 6–26	Set out plants
Turnip	Mar 27–Apr 10, Aug 11–Sep 1	Apr 11–May 22, Jul 13–Aug 10	—	Sow seeds
Watercress	Apr 3–17	Apr 18–May 28	—	Sow seeds
Winter squash	May 18–Jun 20	—	—	Sow seeds

Herbs

Crop	Best time to plant	Also possible	Start indoors	How
Anise hyssop	Jun 4–19	Apr 24–Jun 3	Apr 20–May 5	Set out plants
Basil	Jun 10–17, Jul 7–27	Jun 18–Jul 6	May 6–13, Jun 2–22	Set out plants
Bee balm (bergamot)	Jun 4–19	Apr 24–Jun 3	Apr 16–May 1	Set out plants
Borage	Apr 17–May 10, Jul 15–Aug 13	May 11–Jul 14	—	Sow seeds
Caraway	Apr 3–17, Jul 12–Aug 2	Apr 18–May 3, Jun 6–Jul 11	—	Sow seeds
Catnip	Apr 10–May 1	May 2–22	Feb 20–Mar 13	Set out plants
Chamomile	Mar 27–Apr 10, Jul 27–Aug 17	Apr 11–May 13, Jun 20–Jul 26	—	Sow seeds
Chervil	Apr 3–19, Aug 11–Sep 1	—	—	Sow seeds
Chives	Jun 2–19	Apr 24–Jun 1	Apr 14–May 1	Set out plants
Cilantro	Aug 11–24	Apr 10–22, Jul 31–Aug 10	—	Sow seeds
Cuban oregano	Jun 26–Jul 22	Jun 10–25, Jul 23–Aug 1	—	Set out plants
Dill	Apr 10–17, Jul 28–Aug 18	Apr 18–May 24, Jul 6–27	—	Sow seeds
Epazote	May 18–Jun 1, Jul 21–Aug 11	Jun 2–Jul 20	—	Sow seeds
Fenugreek (methi)	Aug 7–30	Apr 24–May 17, Jul 18–Aug 6	—	Sow seeds
Feverfew	Apr 17–May 6	May 7–Jun 12	Feb 27–Mar 18	Set out plants
Garlic chives	Jun 2–19	Apr 24–Jun 1	Apr 14–May 1	Set out plants
Lavender	May 26–Jun 19	May 1–25	Mar 10–Apr 3	Set out plants
Lemon balm	Apr 10–May 1	May 2–22	Mar 6–27	Set out plants
Lemon verbena	May 26–Jun 19	May 1–25	—	Set out plants
Lovage	Apr 10–May 8	—	Feb 20–Mar 20	Set out plants
Marjoram	May 26–Jun 19	May 1–25	Apr 7–May 1	Set out plants
Mint	Apr 10–May 1	May 2–22	—	Set out plants
Oregano	Jun 1–19	Apr 24–May 31	Apr 13–May 1	Set out plants
Papalo	Jun 10–24	Jun 25–Jul 17	—	Sow seeds
Parsley	Apr 3–17, Jul 12–Aug 2	Apr 18–Jul 11	Jan 30–Feb 13, May 10–31	Set out plants
Rosemary	May 26–Jun 19	May 1–25	Mar 10–Apr 3	Set out plants
Sage	Apr 17–May 4	May 5–Jun 12	Feb 27–Mar 16	Set out plants
Shiso (perilla)	May 18–25	May 26–Jul 24	Apr 13–20	Set out plants
Sorrel (French / garden)	Apr 3–May 1	May 2–29	—	Sow seeds
Stevia	Jun 10–Jul 2	—	—	Set out plants
Summer savory	Apr 27–May 11	May 12–Jul 27	—	Sow seeds
Tarragon (French)	Apr 24–May 10	May 11–Jun 19	—	Set out plants
Thyme	May 27–Jun 19	Apr 24–May 26	Apr 1–24	Set out plants
Vietnamese coriander (rau ram)	Jun 15–Jul 13	May 18–Jun 14	—	Set out plants
Winter savory	Apr 24–May 10	May 11–Jun 19	Mar 6–22	Set out plants

Fruit

Crop	Best time to plant	Also possible	Start indoors	How
Blackberry	Mar 20–Apr 10	Apr 11–May 22	—	Set out plants
Cantaloupe & melons	Jun 10–Jul 2	—	—	Sow seeds
Cucamelon / mouse melon	May 18–Jun 1	Jun 2–Jul 17	Apr 13–27	Set out plants
Fig	Apr 3–May 1	May 2–Jun 12	—	Set out plants
Grape (bunch)	Mar 27–Apr 24	Apr 25–May 8	—	Set out plants
Ground cherry	May 18–Jun 1	Jun 2–Jul 22	Mar 30–Apr 13	Set out plants
Raspberry	Mar 27–Apr 10	Apr 11–29	—	Set out plants
Strawberry	Mar 27–Apr 24	Apr 25–May 22	—	Set out plants
Watermelon	Jun 10–30	—	—	Sow seeds

Flowers

Crop	Best time to plant	Also possible	Start indoors	How
Annual salvia	Jun 18–Jul 30	May 18–Jun 17, Jul 31–Aug 11	Apr 9–May 21	Set out plants
Bachelor's button (cornflower)	Mar 27–Apr 18	Apr 19–28, Jul 31–Aug 14	—	Sow seeds
Black-eyed Susan	Jun 4–Jul 14	Apr 24–Jun 3	—	Sow seeds
Calendula	Apr 10–May 6, Aug 5–29	May 7–21, Jun 30–Aug 4	—	Sow seeds
California poppy	Mar 27–Apr 18	Apr 19–28, Jul 31–Aug 14	—	Sow seeds
Cleome (spider flower)	Jun 13–Jul 10	May 18–Jun 12, Jul 11–12	—	Sow seeds
Coreopsis (tickseed)	Mar 27–Apr 17	Apr 18–May 8	—	Sow seeds
Cosmos	Jun 21–Jul 11	Jun 10–20, Jul 12–21	—	Sow seeds
Globe amaranth (gomphrena)	Jun 21–Jul 11	Jun 10–20, Jul 12–21	May 3–23	Set out plants
Larkspur	Mar 13–Apr 3	—	—	Sow seeds
Marigold	Jun 17–Jul 27	May 18–Jun 16, Jul 28–Aug 6	Apr 29–Jun 8	Set out plants
Milkweed (native)	May 30–Jun 19	Apr 24–May 29	Apr 25–May 15	Set out plants
Nasturtium	Jul 17–Aug 11	Apr 27–May 22, Jul 1–16	—	Sow seeds
Pansy / viola	Mar 13–Apr 3, Aug 24–Sep 13	Apr 4–May 7, Aug 18–23	Jun 8–28, Dec 26–Jan 16	Set out plants
Pentas (Egyptian star cluster)	Jun 30–Jul 31	—	Apr 28–May 29	Set out plants
Purple coneflower (echinacea)	Apr 24–May 10	May 11–Jun 19	Feb 6–22	Set out plants
Snapdragon	Mar 27–Apr 3	Jun 19–25	Jan 23–30	Set out plants
Statice	Apr 24–May 8, Jul 13–Aug 3	May 9–Jul 12	Feb 20–Mar 6, May 11–Jun 1	Set out plants
Stock	Apr 10–24, Aug 11–Sep 1	Apr 25–May 6	Feb 6–20, Jun 9–30	Set out plants
Strawflower	Apr 27–May 11, Jul 21–Aug 10	May 12–Jul 20	Mar 9–23, Jun 2–22	Set out plants
Sunflower	Jun 12–Jul 7	May 18–Jun 11	—	Sow seeds
Sweet alyssum	Apr 3–May 5, Aug 9–31	May 6–22, Jul 1–Aug 8	—	Sow seeds
Sweet pea (flower)	Mar 13–Apr 10	—	—	Sow seeds
Zinnia	Jun 22–Jul 14	Jun 10–21, Jul 15–24	—	Sow seeds

Crops that struggle in Boise

These need a climate Boise doesn't have. Pots, shade cloth or a greenhouse can stretch the rules.

Banana: Has to live outdoors through winter and needs nights no colder than about 45°F; the coldest month here averages 25°F.
Bay laurel: Has to live outdoors through winter and needs nights no colder than about 32°F; the coldest month here averages 25°F.
Blueberry: It needs acid soil, and dry-climate soil is usually alkaline. Grow it in a large pot of acid potting mix.
Bottle gourd / cucuzza: The frost-free season (about 180 days) is shorter than the 70 days it needs.
Cassava (yuca): Has to live outdoors through winter and needs nights no colder than about 40°F; the coldest month here averages 25°F.
Celosia: The frost-free season (about 180 days) is shorter than the 80 days it needs.
Chaya (tree spinach): Has to live outdoors through winter and needs nights no colder than about 40°F; the coldest month here averages 25°F.
Culantro: The frost-free season (about 180 days) is shorter than the 70 days it needs.
Endive & escarole: The frost-free season (about 180 days) is shorter than the 85 days it needs.
Ginger: The frost-free season (about 180 days) is shorter than the 270 days it needs.
Jicama: The frost-free season (about 180 days) is shorter than the 180 days it needs.
Lemongrass: The frost-free season (about 180 days) is shorter than the 88 days it needs.
Luffa gourd: The frost-free season (about 180 days) is shorter than the 105 days it needs.
Moringa: The frost-free season (about 180 days) is shorter than the 75 days it needs.
Muscadine grape: Has to live outdoors through winter and needs nights no colder than about 26°F; the coldest month here averages 25°F.
Papaya: Has to live outdoors through winter and needs nights no colder than about 48°F; the coldest month here averages 25°F.
Passion fruit: Has to live outdoors through winter and needs nights no colder than about 44°F; the coldest month here averages 25°F.
Peanut: The frost-free season (about 180 days) is shorter than the 130 days it needs.
Pigeon pea: The frost-free season (about 180 days) is shorter than the 150 days it needs.
Pineapple: Has to live outdoors through winter and needs nights no colder than about 45°F; the coldest month here averages 25°F.
Roselle: The frost-free season (about 180 days) is shorter than the 165 days it needs.
Rutabaga: The frost-free season (about 180 days) is shorter than the 95 days it needs.
Seminole pumpkin / calabaza: The frost-free season (about 180 days) is shorter than the 108 days it needs.
Southern pea / cowpea: The frost-free season (about 180 days) is shorter than the 75 days it needs.
Sweet potato: The frost-free season (about 180 days) is shorter than the 105 days it needs.
Taro (dasheen): The frost-free season (about 180 days) is shorter than the 225 days it needs.
Winged bean: The frost-free season (about 180 days) is shorter than the 105 days it needs.
Winter melon / wax gourd: The frost-free season (about 180 days) is shorter than the 105 days it needs.
Yardlong bean: The frost-free season (about 180 days) is shorter than the 70 days it needs.

Nearby planting calendars

Salt Lake City, UT 296 mi · last frost around Mar 31
Portland, OR 345 mi · last frost around Feb 25
Seattle, WA 405 mi · last frost around Mar 13
Billings, MT 407 mi · last frost around May 10
Sacramento, CA 443 mi · frost only briefly in winter
All Idaho cities

How these dates are worked out

Each crop has temperature limits and timing from university extension guides: how cold a night it can take, how much heat it can stand, how long it takes to mature, and how far before or after the last frost it goes in. Those are checked day by day against the Boise Air Terminal station's NOAA 1991–2020 climate normals (average highs, lows, rain and frost dates). Dates are estimates for a typical year; a sheltered yard, a slope or a cold pocket can shift them by a week or two.

Weather: NOAA National Centers for Environmental Information, 1991–2020 U.S. Climate Normals. Crop timing: university extension guides (sources listed for each crop in the app). City locations: GeoNames (CC BY 4.0).