Frost Dates for Jackson, WY 83001
Last spring frost July 10 · First fall frost August 16 · 37 frost-free days · USDA Zone 4b
ZIP 83001 has about 17,400 people.
Short season: 37 frost-free days. Spring frost risk spans June 24–July 26 (32 days). Fall frost risk spans July 31–September 1 (32 days).
Frost probability for 83001
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | July 26 | July 10 | June 24 |
| Fall (first frost) | July 31 | August 16 | September 1 |
Dates come from NOAA 1971–2000 freeze probabilities at JACKSON (15.0 km away); the 50% date is the median year.
Which crops fit a 37-day season in Jackson
In Jackson (37 frost-free days, a short season), 15 of 56 planner crops fit outright, 3 get two plantings, 2 need an indoor start, 35 don't reliably mature, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Jun 5 | Jul 24–Jul 31 | 0 | no-fit: Needs 80 days; Jackson has 0 after Jul 24. | — |
| Pepper | May 29 | Jul 24–Jul 31 | 0 | no-fit: Needs 75 days; Jackson has 0 after Jul 24. | — |
| Lettuce | May 15 | Jun 12–Jun 19 | 72 | fits: 45 days to maturity, 72 available after Jun 12. | Jun 25 |
| Carrots | — | Jun 19–Jun 26 | 79 | fits: 70 days to maturity, 79 available after Jun 19. | — |
| Cucumber | Jun 19 | Jul 24–Jul 31 | 9 | no-fit: Needs 60 days; Jackson has 9 after Jul 24. | — |
| Beans | — | Jul 17–Jul 31 | 23 | no-fit: Needs 60 days; Jackson has 23 after Jul 17. | — |
| Peas | — | May 15–Jul 24 | 100 | fits: 65 days to maturity, 100 available after May 15. | Jun 5 |
| Zucchini | Jun 26 | Jul 24–Jul 31 | 9 | no-fit: Needs 55 days; Jackson has 9 after Jul 24. | — |
| Onion | Apr 17 | Jun 12–Jun 26 | 72 | no-fit: Needs 100 days; Jackson has 72 after Jun 12. | — |
| Spinach | — | May 15–Jul 3 | 114 | two-plantings: Plant May 15 and again by Jul 14; both mature before Sep 6. | Jul 14 |
| Kale | May 1 | Jun 12–Jun 26 | 86 | fits: 55 days to maturity, 86 available after Jun 12. | Jun 29 |
| Broccoli | May 15 | Jun 12–Jun 26 | 72 | head-start: Even planted out Jun 12, the outdoor season is about 8 days short; choose an early variety or grow under cover. | — |
| Cabbage | May 15 | Jun 12–Jun 26 | 86 | fits: 70 days to maturity, 86 available after Jun 12. | Jun 14 |
| Radish | — | May 15–Aug 7 | 100 | two-plantings: Plant May 15 and again by Jul 15; both mature before Aug 23. | Jul 15 |
| Beets | — | May 15–Aug 7 | 100 | fits: 55 days to maturity, 100 available after May 15. | Jun 15 |
| Potatoes | — | Jun 26–Jul 3 | 58 | no-fit: Needs 90 days; Jackson has 58 after Jun 26. | — |
| Garlic | — | Aug 16 | 142 | overwinter: Plant Aug 16 to Sep 6; harvest the following summer. | Sep 6 |
| Strawberry | — | Jun 5–Jul 31 | 93 | perennial: A perennial: plant Jun 5; it fruits from the following year and keeps producing for several years. | — |
| Corn | Jun 12 | Jul 17–Jul 24 | 9 | no-fit: Needs 75 days; Jackson has 9 after Jul 17. | — |
| Pumpkin | Jun 26 | Jul 24–Jul 24 | 2 | no-fit: Needs 100 days; Jackson has 2 after Jul 24. | — |
| Cauliflower | May 29 | Jul 3–Jul 17 | 51 | no-fit: Needs 75 days; Jackson has 51 after Jul 3. | — |
| Swiss Chard | May 15 | Jun 26–Jun 26 | 58 | fits: 55 days to maturity, 58 available after Jun 26. | — |
| Arugula | — | May 15–Aug 7 | 114 | two-plantings: Plant May 15 and again by Jul 14; both mature before Sep 6. | Jul 14 |
| Brussel Sprouts | May 15 | Jun 12–Jun 26 | 86 | head-start: Even planted out Jun 12, the outdoor season is about 14 days short; choose an early variety or grow under cover. | — |
| Butternut Squash | Jun 26 | Jul 24–Jul 31 | 2 | no-fit: Needs 100 days; Jackson has 2 after Jul 24. | — |
| Eggplant | May 22 | Jul 24–Jul 31 | 0 | no-fit: Needs 70 days; Jackson has 0 after Jul 24. | — |
| Okra | Jun 12 | Jul 17–Jul 24 | 16 | no-fit: Needs 55 days; Jackson has 16 after Jul 17. | — |
| Basil | Jun 5 | Jul 31–Jul 31 | 2 | no-fit: Needs 60 days; Jackson has 2 after Jul 31. | — |
| Cilantro | — | Jun 12–Jul 3 | 72 | fits: 50 days to maturity, 72 available after Jun 12. | Jun 20 |
| Parsley | May 1 | Jul 17–Jul 24 | 37 | no-fit: Needs 70 days; Jackson has 37 after Jul 17. | — |
| Celery | May 1 | Jul 17–Jul 31 | 37 | no-fit: Needs 120 days; Jackson has 37 after Jul 17. | — |
| Scallions | May 1 | Jun 12–Jun 26 | 86 | fits: 60 days to maturity, 86 available after Jun 12. | Jun 24 |
| Turnip | — | Jun 12–Jun 26 | 86 | fits: 50 days to maturity, 86 available after Jun 12. | Jul 4 |
| Kohlrabi | — | May 29–Jun 12 | 100 | fits: 55 days to maturity, 100 available after May 29. | Jun 29 |
| Bok Choy | Jun 12 | Jul 3–Jul 10 | 51 | fits: 45 days to maturity, 51 available after Jul 3. | — |
| Collards | May 1 | Jun 12–Jun 26 | 86 | fits: 60 days to maturity, 86 available after Jun 12. | Jun 24 |
| Cantaloupe | Jun 26 | Jul 24–Jul 31 | 0 | no-fit: Needs 85 days; Jackson has 0 after Jul 24. | — |
| Chives | Apr 17 | Jul 17–Jul 24 | 51 | no-fit: Needs 90 days; Jackson has 51 after Jul 17. | — |
| Dill | — | May 15–Aug 7 | 100 | fits: 55 days to maturity, 100 available after May 15. | Jun 15 |
| Oregano | May 1 | Jul 17–Jul 24 | 51 | no-fit: Needs 80 days; Jackson has 51 after Jul 17. | — |
| Rosemary | Apr 17 | Jul 17–Jul 24 | 37 | no-fit: Needs 80 days; Jackson has 37 after Jul 17. | — |
| Sage | May 15 | Jul 17–Jul 24 | 51 | no-fit: Needs 75 days; Jackson has 51 after Jul 17. | — |
| Thyme | May 1 | Jul 17–Jul 24 | 51 | no-fit: Needs 90 days; Jackson has 51 after Jul 17. | — |
| Calendula | May 29 | Jun 26–Jul 10 | 58 | fits: 50 days to maturity, 58 available after Jun 26. | — |
| Cosmos | Jun 12 | Jul 10–Jul 24 | 23 | no-fit: Needs 60 days; Jackson has 23 after Jul 10. | — |
| Lavender | Apr 17 | Jul 10–Jul 24 | 58 | no-fit: Needs 90 days; Jackson has 58 after Jul 10. | — |
| Marigolds | May 29 | Jul 10–Jul 17 | 23 | no-fit: Needs 50 days; Jackson has 23 after Jul 10. | — |
| Melons | Jun 26 | Jul 24–Jul 31 | 0 | no-fit: Needs 85 days; Jackson has 0 after Jul 24. | — |
| Mint | — | Jul 10–Jul 24 | 58 | no-fit: Needs 90 days; Jackson has 58 after Jul 10. | — |
| Nasturtiums | Jun 12 | Jul 10–Jul 17 | 23 | no-fit: Needs 55 days; Jackson has 23 after Jul 10. | — |
| Pole Beans | — | Jul 17–Jul 31 | 16 | no-fit: Needs 65 days; Jackson has 16 after Jul 17. | — |
| Spaghetti Squash | Jun 26 | Jul 24–Jul 31 | 2 | no-fit: Needs 90 days; Jackson has 2 after Jul 24. | — |
| Sunflowers | — | Jul 10–Jul 24 | 23 | no-fit: Needs 70 days; Jackson has 23 after Jul 10. | — |
| Tomatillos | May 15 | Jul 17–Jul 24 | 2 | no-fit: Needs 75 days; Jackson has 2 after Jul 17. | — |
| Watermelon | Jun 26 | Jul 17–Jul 24 | 2 | no-fit: Needs 80 days; Jackson has 2 after Jul 17. | — |
| Yellow Squash | Jun 26 | Jul 24–Jul 31 | 9 | no-fit: Needs 55 days; Jackson has 9 after Jul 24. | — |
| Zinnias | Jun 12 | Jul 10–Jul 24 | 23 | no-fit: Needs 60 days; Jackson has 23 after Jul 10. | — |
Month by month in Jackson
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start the slowest-growing crops indoors: onions, leeks, and celery (10–12 weeks before last frost). |
| March | Organize planting supplies and seed-starting mix. Check stored garden tools. |
| April | Start indoors: Chives (Apr 17), Lavender (Apr 17), Onion (Apr 17), Rosemary (Apr 17). |
| May | Start indoors: Celery (May 1), Collards (May 1), Kale (May 1), Oregano (May 1), Parsley (May 1), Scallions (May 1), +13 more. Direct sow from: Arugula (May 15), Beets (May 15), Dill (May 15), Peas (May 15), Radish (May 15), Spinach (May 15), +1 more. |
| June | Start indoors: Basil (Jun 5), Tomato (Jun 5), Bok Choy (Jun 12), Corn (Jun 12), Cosmos (Jun 12), Nasturtiums (Jun 12), +11 more. Direct sow from: Cilantro (Jun 12), Turnip (Jun 12), Carrots (Jun 19), Potatoes (Jun 26). Transplant from: Broccoli (Jun 12), Brussel Sprouts (Jun 12), Cabbage (Jun 12), Collards (Jun 12), Kale (Jun 12), Lettuce (Jun 12), +4 more. Plant: Strawberry (Jun 5). Last sowing dates: Peas (Jun 5), Cabbage (Jun 14), Beets (Jun 15), Dill (Jun 15), Cilantro (Jun 20), Collards (Jun 24), +4 more. |
| July | Direct sow from: Sunflowers (Jul 10), Beans (Jul 17), Pole Beans (Jul 17). Transplant from: Bok Choy (Jul 3), Cauliflower (Jul 3), Cosmos (Jul 10), Lavender (Jul 10), Marigolds (Jul 10), Mint (Jul 10), +25 more. Last frost around July 10. Last sowing dates: Turnip (Jul 4), Arugula (Jul 14), Spinach (Jul 14), Radish (Jul 15). |
| August | Direct sow from: Garlic (Aug 16). First frost around August 16. |
| September | Last sowing dates: Garlic (Sep 6). |
| October | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
| November | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
| December | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
Frequently Asked Questions
What is the last frost date for Jackson, WY (ZIP 83001)?
The median last spring frost date for Jackson, WY (ZIP code 83001) is around July 10. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area. One year in ten frost ends before June 24; one in ten it runs past July 26.
What is the first fall frost date in Jackson, WY?
The median first fall frost date for Jackson, WY is around August 16. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses. The first frost arrives around July 31 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Jackson, WY?
The frost-free growing season in Jackson is about 37 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side. In Jackson (37 frost-free days, a short season), 15 of 56 planner crops fit outright, 3 get two plantings, 2 need an indoor start, 35 don't reliably mature, 1 crop is perennial.
What USDA hardiness zone is Jackson, WY?
Jackson, WY is in USDA hardiness zone 4b (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in Jackson, WY?
Start tomatoes indoors Jun 5 and plant out Jul 24 in Jackson. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Jackson?
One spring planting around Jun 12. The last sow date is Jun 25.
When do I plant garlic in Jackson?
Aug 16 to Sep 6; it overwinters and is ready the following summer.
Can I grow Celery in Jackson?
Not reliably outdoors. Needs 120 days; Jackson has 37 after Jul 17.
Which nearby ZIP has a longer season?
Rigby (ZIP 83442) has 85 frost-free days, 48 more than Jackson (ZIP 83001). See Rigby ZIP 83442 frost dates
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- When to plant in WY
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