Planting calendar for Billings, Montana

Dates from 30 years of records at the Billings Wtp weather station, 1.2 miles from Billings, worked out crop by crop with the same method as the Year Round Garden app.

Billings at a glance

Weather station: Billings Wtp · 1.2 mi
USDA zone: 5a
Last spring frost: typically May 10; 1 year in 10 after May 24
First fall frost: typically Oct 1; 1 year in 10 before Sep 19
Frost-free season: about 144 days
Hottest month: July: highs 86°F, nights 56°F
Coldest month: January: highs 36°F, nights 14°F
Rain: 15 in. a year, most in April, May and June

What shapes the seasons here

The last spring frost in Billings typically comes around May 10, but 1 year in 10 it comes after May 24. The first fall frost typically arrives around Oct 1. That leaves about 144 frost-free days for tender crops like tomatoes, peppers and squash.

Billings gets about 15 inches of rain a year, most of it in April, May and June.

126 of the 174 crops in the app grow here; 48 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)

Cucumber (slicing)

Summer squash & zucchini

Bean (bush snap)

Sweet corn

Potato

Pea (snap & snow)

Lettuce (leaf & mesclun)

Spinach

Kale

Collard greens

Broccoli

Cabbage

Carrot

Radish

Onion (bulbing)

Garlic

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 Billings, month by month

January0

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

Start seeds indoors

Pansy / viola

February0

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

Start seeds indoors

Artichoke, Cabbage, Celeriac (celery root), Leek, Parsley, Snapdragon, Stock

March0

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, Celeriac (celery root), Celery, Onion (bulbing), Catnip, Lavender, Lemon balm, Rosemary, Purple coneflower (echinacea), Statice, Stock

April47

Best time to plant

Vegetables: Arugula, Asparagus, Beet, Broccoli, Broccoli raab (rapini), Brussels sprouts, Cabbage, Carrot, Cauliflower, Chinese broccoli (gai lan), Collard greens, Daikon radish, Endive & escarole, Fava bean, Green onion / scallion, Kale, Kohlrabi, Leek, Lettuce (leaf & mesclun), Mustard greens, Parsnip, Pea (shelling / English), Pea (snap & snow), Radicchio, Radish, Rhubarb, Salsify, Shallot, Spinach, Swiss chard, Turnip, Watercress

Herbs: Caraway, Chamomile, Parsley, Sorrel (French / garden)

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

Flowers: Bachelor's button (cornflower), California poppy, Larkspur, Pansy / viola, Snapdragon, Sweet alyssum, Sweet pea (flower)

Can also plant

Lettuce (romaine & head), Mache (corn salad), Onion (bulbing), Potato, Sunchoke (Jerusalem artichoke), Chervil, Coreopsis (tickseed)

Start seeds indoors

Leek, Pepper (sweet / bell), Tomato (cherry & grape), Tomato (paste / determinate), Tomato (slicing), Anise hyssop, Bee balm (bergamot), Chives, Feverfew, Garlic chives, Lavender, Lemon balm, Lovage, Marjoram, Oregano, Parsley, Sage, Thyme, Winter savory, Ground cherry, Annual salvia, Purple coneflower (echinacea), Snapdragon, Statice, Strawflower

May32

Best time to plant

Vegetables: Artichoke, Asparagus, Cardoon, Carrot, Celeriac (celery root), Celery, Chickpea / garbanzo, Chinese broccoli (gai lan), Fennel (bulb), Garden cress, Onion (bulbing), Parsnip, Potato, Radish, Rhubarb, Salsify, Sunchoke (Jerusalem artichoke), Swiss chard, Tomato (early / short-season)

Herbs: Catnip, Lemon balm, Lovage, Mint, Sorrel (French / garden), Summer savory

Fruit: Grape (bunch), Strawberry

Flowers: Calendula, Statice, Stock, Strawflower, Sweet alyssum

Can also plant

Arugula, Beet, Broccoli, Broccoli raab (rapini), Brussels sprouts, Cabbage, Cauliflower, Collard greens, Daikon radish, Green onion / scallion, Kale, Kohlrabi, Komatsuna (mustard spinach), Leek, Lettuce (leaf & mesclun), Mustard greens, Napa / Chinese cabbage, Pea (shelling / English), Pea (snap & snow), Shallot, Spinach, Turnip, Watercress, Anise hyssop, Bee balm (bergamot), Borage, Caraway, Chamomile, Chives, Dill, Fenugreek (methi), Feverfew, Garlic chives, Lavender, Lemon verbena, Marjoram, Oregano, Parsley, Rosemary, Sage, Tarragon (French), Thyme, Winter savory, Blackberry, Raspberry, Bachelor's button (cornflower), Black-eyed Susan, California poppy, Coreopsis (tickseed), Milkweed (native), Nasturtium, Pansy / viola, Purple coneflower (echinacea), Snapdragon

Start seeds indoors

Broccoli, Brussels sprouts, Cabbage, Cauliflower, Tomatillo, Tomato (cherry & grape), Tomato (early / short-season), Tomato (paste / determinate), Anise hyssop, Bee balm (bergamot), Chives, Feverfew, Garlic chives, Oregano, Parsley, Sage, Shiso (perilla), Thyme, Winter savory, Cucamelon / mouse melon, Annual salvia, Marigold, Milkweed (native), Pansy / viola, Statice, Stock, Strawflower

June66

Best time to plant

Vegetables: Armenian cucumber, Asparagus, Bean (bush snap), Bean (dry / shelling), Bean (pole), Bitter melon, Brussels sprouts, Cabbage, Cauliflower, Celeriac (celery root), Cucumber (pickling), Cucumber (slicing), Endive & escarole, Fennel (bulb), Leek, New Zealand spinach, Onion (bulbing), Pepper (sweet / bell), Potato, Rhubarb, Rutabaga, Shallot, Summer squash & zucchini, Sweet corn, Tomatillo, Tomato (cherry & grape), Tomato (early / short-season), Tomato (paste / determinate), Tomato (slicing)

Herbs: Anise hyssop, Bee balm (bergamot), Borage, Caraway, Chives, Epazote, Feverfew, Garlic chives, Lavender, Lemon balm, Lemon verbena, Lovage, Marjoram, Oregano, Parsley, Rosemary, Sage, Shiso (perilla), Tarragon (French), Thyme, Vietnamese coriander (rau ram), Winter savory

Fruit: Cucamelon / mouse melon, Ground cherry

Flowers: Annual salvia, Bachelor's button (cornflower), Black-eyed Susan, California poppy, Cleome (spider flower), Coreopsis (tickseed), Marigold, Milkweed (native), Nasturtium, Purple coneflower (echinacea), Snapdragon, Statice, Sunflower

Can also plant

Beet, Broccoli, Carrot, Chinese broccoli (gai lan), Collard greens, Garden cress, Kale, Kohlrabi, Komatsuna (mustard spinach), Lettuce (romaine & head), Napa / Chinese cabbage, Parsnip, Pea (shelling / English), Pea (snap & snow), Radish, Swiss chard, Turnip, Watercress, Chamomile, Cilantro, Dill, Sorrel (French / garden), Summer savory, Calendula, Strawflower, Sweet alyssum

Start seeds indoors

Broccoli, Lettuce (romaine & head), Pansy / viola, Stock

July54

Best time to plant

Vegetables: Amaranth greens / callaloo, Arugula, Bean (bush snap), Bean (pole), Beet, Bok choy / pak choi, Broccoli, Broccoli raab (rapini), Brussels sprouts, Cabbage, Carrot, Cauliflower, Chinese broccoli (gai lan), Collard greens, Cucumber (pickling), Cucumber (slicing), Daikon radish, Kohlrabi, Komatsuna (mustard spinach), Lettuce (leaf & mesclun), Lettuce (romaine & head), Mustard greens, Napa / Chinese cabbage, New Zealand spinach, Pea (shelling / English), Pea (snap & snow), Purslane, Rutabaga, Summer squash & zucchini, Swiss chard, Tomato (cherry & grape), Tomato (early / short-season), Turnip

Herbs: Borage, Caraway, Chamomile, Chervil, Cilantro, Cuban oregano, Dill, Epazote, Fenugreek (methi), Parsley, Vietnamese coriander (rau ram)

Flowers: Annual salvia, Bachelor's button (cornflower), Calendula, California poppy, Marigold, Nasturtium, Statice, Stock, Strawflower, Sweet alyssum

Can also plant

Garden cress, Kale, Radish, Spinach, Pansy / viola

August19

Best time to plant

Vegetables: Arugula, Broccoli raab (rapini), Garden cress, Kale, Kohlrabi, Komatsuna (mustard spinach), Lettuce (leaf & mesclun), Mache (corn salad), Mustard greens, Radish, Spinach, Swiss chard, Turnip

Herbs: Chervil, Fenugreek (methi)

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

September2

Best time to plant

Vegetables: Elephant garlic, Garlic

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 Billings

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

Herbs

Crop	Best time to plant	Also possible	Start indoors	How
Anise hyssop	Jun 7–Jul 5	May 10–Jun 6	Apr 23–May 21	Set out plants
Bee balm (bergamot)	Jun 7–Jul 5	May 10–Jun 6	Apr 19–May 17	Set out plants
Borage	Jun 24–Jul 24	May 3–Jun 23	—	Sow seeds
Caraway	Apr 19–May 3, Jun 22–Jul 13	May 4–Jun 21	—	Sow seeds
Catnip	Apr 26–May 15	May 16–Jun 7	Mar 8–27	Set out plants
Chamomile	Apr 12–26, Jul 7–28	Apr 27–Jul 6	—	Sow seeds
Chervil	Jul 19–Aug 12	Apr 19–May 5, Jun 30–Jul 18	—	Sow seeds
Chives	Jun 7–Jul 5	May 10–Jun 6	Apr 19–May 17	Set out plants
Cilantro	Jul 7–Aug 4	Apr 26–May 8, Jun 21–Jul 6	—	Sow seeds
Cuban oregano	Jul 1–10	—	—	Set out plants
Dill	Apr 26–May 3, Jul 8–29	May 4–Jul 7	—	Sow seeds
Epazote	Jun 6–20, Jul 1–22	Jun 21–30	—	Sow seeds
Fenugreek (methi)	Jul 15–Aug 10	May 10–Jun 5, Jul 6–14	—	Sow seeds
Feverfew	Jun 2–28	May 3–Jun 1	Apr 14–May 10	Set out plants
Garlic chives	Jun 7–Jul 5	May 10–Jun 6	Apr 19–May 17	Set out plants
Lavender	Jun 10–Jul 3	May 17–Jun 9	Mar 25–Apr 17	Set out plants
Lemon balm	Apr 26–Jun 7	—	Mar 22–May 3	Set out plants
Lemon verbena	Jun 7–27	May 18–Jun 6	—	Set out plants
Lovage	May 22–Jun 7	Apr 26–May 21	Apr 3–19	Set out plants
Marjoram	Jun 5–22	May 18–Jun 4	Apr 17–May 4	Set out plants
Mint	Apr 29–May 14	Apr 26–28, May 15–Jun 7	—	Set out plants
Oregano	Jun 7–Jul 5	May 10–Jun 6	Apr 19–May 17	Set out plants
Parsley	Apr 19–May 3, Jun 22–Jul 13	May 4–Jun 21	Feb 15–Mar 1, Apr 20–May 11	Set out plants
Rosemary	Jun 3–19	May 17–Jun 2	Mar 18–Apr 3	Set out plants
Sage	Jun 1–28	May 3–31	Apr 13–May 10	Set out plants
Shiso (perilla)	Jun 6–13	Jun 14–Jul 4	May 2–9	Set out plants
Sorrel (French / garden)	Apr 19–May 16	May 17–Jun 14	—	Sow seeds
Summer savory	May 18–Jun 1	Jun 2–Jul 7	—	Sow seeds
Tarragon (French)	Jun 7–Jul 5	May 10–Jun 6	—	Set out plants
Thyme	Jun 6–Jul 3	May 10–Jun 5	Apr 11–May 8	Set out plants
Vietnamese coriander (rau ram)	Jun 22–Jul 10	Jun 6–21, Jul 11–12	—	Set out plants
Winter savory	Jun 7–Jul 5	May 10–Jun 6	Apr 19–May 17	Set out plants

Fruit

Crop	Best time to plant	Also possible	Start indoors	How
Blackberry	Apr 5–26	Apr 27–Jun 7	—	Set out plants
Cucamelon / mouse melon	Jun 6–20	Jun 21–27	May 2–16	Set out plants
Grape (bunch)	Apr 12–May 10	May 11–24	—	Set out plants
Ground cherry	Jun 6–20	Jun 21–Jul 2	Apr 18–May 2	Set out plants
Raspberry	Apr 12–26	Apr 27–Jun 7	—	Set out plants
Strawberry	Apr 16–May 11	Apr 12–15, May 12–Jun 7	—	Set out plants

Flowers

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

Crops that struggle in Billings

These need a climate Billings 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 14°F.
Basil: The frost-free season (about 144 days) is shorter than the 58 days it needs.
Bay laurel: Has to live outdoors through winter and needs nights no colder than about 32°F; the coldest month here averages 14°F.
Bean (lima): The frost-free season (about 144 days) is shorter than the 78 days it needs.
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 144 days) is shorter than the 70 days it needs.
Cantaloupe & melons: The frost-free season (about 144 days) is shorter than the 82 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 14°F.
Celosia: The frost-free season (about 144 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 14°F.
Cosmos: The frost-free season (about 144 days) is shorter than the 70 days it needs.
Culantro: The frost-free season (about 144 days) is shorter than the 70 days it needs.
Edamame: The frost-free season (about 144 days) is shorter than the 82 days it needs.
Eggplant: The frost-free season (about 144 days) is shorter than the 72 days it needs.
Fig: Has to live outdoors through winter and needs nights no colder than about 22°F; the coldest month here averages 14°F.
Ginger: The frost-free season (about 144 days) is shorter than the 270 days it needs.
Globe amaranth (gomphrena): The frost-free season (about 144 days) is shorter than the 70 days it needs.
Jicama: The frost-free season (about 144 days) is shorter than the 180 days it needs.
Lemongrass: The frost-free season (about 144 days) is shorter than the 88 days it needs.
Luffa gourd: The frost-free season (about 144 days) is shorter than the 105 days it needs.
Malabar spinach: The frost-free season (about 144 days) is shorter than the 65 days it needs.
Moringa: The frost-free season (about 144 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 14°F.
Okinawa spinach: The frost-free season (about 144 days) is shorter than the 52 days it needs.
Okra: The frost-free season (about 144 days) is shorter than the 58 days it needs.
Papalo: The frost-free season (about 144 days) is shorter than the 68 days it needs.
Papaya: Has to live outdoors through winter and needs nights no colder than about 48°F; the coldest month here averages 14°F.
Passion fruit: Has to live outdoors through winter and needs nights no colder than about 44°F; the coldest month here averages 14°F.
Peanut: The frost-free season (about 144 days) is shorter than the 130 days it needs.
Pentas (Egyptian star cluster): The frost-free season (about 144 days) is shorter than the 38 days it needs.
Pepper (hot / chili): The frost-free season (about 144 days) is shorter than the 80 days it needs.
Pigeon pea: The frost-free season (about 144 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 14°F.
Popcorn: The frost-free season (about 144 days) is shorter than the 102 days it needs.
Pumpkin: The frost-free season (about 144 days) is shorter than the 105 days it needs.
Roselle: The frost-free season (about 144 days) is shorter than the 165 days it needs.
Seminole pumpkin / calabaza: The frost-free season (about 144 days) is shorter than the 108 days it needs.
Southern pea / cowpea: The frost-free season (about 144 days) is shorter than the 75 days it needs.
Stevia: The frost-free season (about 144 days) is shorter than the 100 days it needs.
Sweet potato: The frost-free season (about 144 days) is shorter than the 105 days it needs.
Taro (dasheen): The frost-free season (about 144 days) is shorter than the 225 days it needs.
Tomato (heat-set varieties): The frost-free season (about 144 days) is shorter than the 75 days it needs.
Watermelon: The frost-free season (about 144 days) is shorter than the 85 days it needs.
Winged bean: The frost-free season (about 144 days) is shorter than the 105 days it needs.
Winter melon / wax gourd: The frost-free season (about 144 days) is shorter than the 105 days it needs.
Winter squash: The frost-free season (about 144 days) is shorter than the 95 days it needs.
Yardlong bean: The frost-free season (about 144 days) is shorter than the 70 days it needs.
Zinnia: The frost-free season (about 144 days) is shorter than the 68 days it needs.

Nearby planting calendars

Cheyenne, WY 370 mi · last frost around May 14
Salt Lake City, UT 387 mi · last frost around Mar 31
Boise, ID 407 mi · last frost around Apr 24
Denver, CO 454 mi · last frost around Apr 30
Fargo, ND 563 mi · last frost around May 5
All Montana 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 Billings Wtp 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).