Frost Dates for Powell, WY 82435
Last spring frost May 21 · First fall frost September 16 · 118 frost-free days · USDA Zone 5a
ZIP 82435 has about 12,300 people.
Short season: 118 frost-free days. Spring frost risk spans May 5–June 7 (33 days). Fall frost risk spans September 4–September 29 (25 days).
Frost probability for 82435
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | June 7 | May 21 | May 5 |
| Fall (first frost) | September 4 | September 16 | September 29 |
Dates come from NOAA 1971–2000 freeze probabilities at HEART MTN (14.6 km away); the 50% date is the median year.
Which crops fit a 118-day season in Powell
In Powell (118 frost-free days, a short season), 33 of 56 planner crops fit outright, 15 get two plantings, 7 need an indoor start, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Apr 16 | Jun 4–Jun 11 | 76 | head-start: Even planted out Jun 4, the outdoor season is about 4 days short; choose an early variety or grow under cover. | — |
| Pepper | Apr 9 | Jun 4–Jun 11 | 76 | fits: 75 days to maturity, 76 available after Jun 4. | — |
| Lettuce | Mar 26 | Apr 23–Apr 30 | 153 | two-plantings: Plant Apr 23 and again by Jul 26; both mature before Sep 23. | Jul 26 |
| Carrots | — | Apr 30–May 7 | 160 | fits: 70 days to maturity, 160 available after Apr 30. | Jul 15 |
| Cucumber | Apr 30 | Jun 4–Jun 11 | 90 | fits: 60 days to maturity, 90 available after Jun 4. | Jun 20 |
| Beans | — | May 28–Jun 11 | 104 | fits: 60 days to maturity, 104 available after May 28. | Jun 27 |
| Peas | — | Mar 26–Jun 4 | 181 | fits: 65 days to maturity, 181 available after Mar 26. | Jul 6 |
| Zucchini | May 7 | Jun 4–Jun 11 | 90 | fits: 55 days to maturity, 90 available after Jun 4. | Jun 25 |
| Onion | Feb 26 | Apr 23–May 7 | 153 | fits: 100 days to maturity, 153 available after Apr 23. | — |
| Spinach | — | Mar 26–May 14 | 195 | two-plantings: Plant Mar 26 and again by Aug 14; both mature before Oct 7. | Aug 14 |
| Kale | Mar 12 | Apr 23–May 7 | 167 | two-plantings: Plant Apr 23 and again by Jul 30; both mature before Oct 7. | Jul 30 |
| Broccoli | Mar 26 | Apr 23–May 7 | 153 | fits: 80 days to maturity, 153 available after Apr 23. | Jun 21 |
| Cabbage | Mar 26 | Apr 23–May 7 | 167 | fits: 70 days to maturity, 167 available after Apr 23. | Jul 15 |
| Radish | — | Mar 26–Jun 18 | 181 | two-plantings: Plant Mar 26 and again by Aug 15; both mature before Sep 23. | Aug 15 |
| Beets | — | Mar 26–Jun 18 | 181 | two-plantings: Plant Mar 26 and again by Jul 16; both mature before Sep 23. | Jul 16 |
| Potatoes | — | May 7–May 14 | 139 | fits: 90 days to maturity, 139 available after May 7. | — |
| Garlic | — | Sep 16 | 223 | overwinter: Plant Sep 16 to Oct 7; harvest the following summer. | Oct 7 |
| Strawberry | — | Apr 16–Jun 11 | 174 | perennial: A perennial: plant Apr 16; it fruits from the following year and keeps producing for several years. | — |
| Corn | Apr 23 | May 28–Jun 4 | 90 | fits: 75 days to maturity, 90 available after May 28. | May 29 |
| Pumpkin | May 7 | Jun 4–Jun 4 | 83 | head-start: Even planted out Jun 4, the outdoor season is about 17 days short; choose an early variety or grow under cover. | — |
| Cauliflower | Apr 9 | May 14–May 28 | 132 | fits: 75 days to maturity, 132 available after May 14. | Jun 26 |
| Swiss Chard | Mar 26 | May 7–May 7 | 139 | two-plantings: Plant May 7 and again by Jul 16; both mature before Sep 23. | Jul 16 |
| Arugula | — | Mar 26–Jun 18 | 195 | two-plantings: Plant Mar 26 and again by Aug 14; both mature before Oct 7. | Aug 14 |
| Brussel Sprouts | Mar 26 | Apr 23–May 7 | 167 | fits: 100 days to maturity, 167 available after Apr 23. | Jun 15 |
| Butternut Squash | May 7 | Jun 4–Jun 11 | 83 | head-start: Even planted out Jun 4, the outdoor season is about 17 days short; choose an early variety or grow under cover. | — |
| Eggplant | Apr 2 | Jun 4–Jun 11 | 76 | fits: 70 days to maturity, 76 available after Jun 4. | — |
| Okra | Apr 23 | May 28–Jun 4 | 97 | fits: 55 days to maturity, 97 available after May 28. | Jun 25 |
| Basil | Apr 16 | Jun 11–Jun 11 | 83 | fits: 60 days to maturity, 83 available after Jun 11. | Jun 20 |
| Cilantro | — | Apr 23–May 14 | 153 | two-plantings: Plant Apr 23 and again by Jul 21; both mature before Sep 23. | Jul 21 |
| Parsley | Mar 12 | May 28–Jun 4 | 118 | fits: 70 days to maturity, 118 available after May 28. | Jul 1 |
| Celery | Mar 12 | May 28–Jun 11 | 118 | head-start: Even planted out May 28, the outdoor season is about 2 days short; choose an early variety or grow under cover. | — |
| Scallions | Mar 12 | Apr 23–May 7 | 167 | two-plantings: Plant Apr 23 and again by Jul 25; both mature before Oct 7. | Jul 25 |
| Turnip | — | Apr 23–May 7 | 167 | two-plantings: Plant Apr 23 and again by Aug 4; both mature before Oct 7. | Aug 4 |
| Kohlrabi | — | Apr 9–Apr 23 | 181 | two-plantings: Plant Apr 9 and again by Jul 30; both mature before Oct 7. | Jul 30 |
| Bok Choy | Apr 23 | May 14–May 21 | 132 | two-plantings: Plant May 14 and again by Jul 26; both mature before Sep 23. | Jul 26 |
| Collards | Mar 12 | Apr 23–May 7 | 167 | two-plantings: Plant Apr 23 and again by Jul 25; both mature before Oct 7. | Jul 25 |
| Cantaloupe | May 7 | Jun 4–Jun 11 | 76 | head-start: Even planted out Jun 4, the outdoor season is about 9 days short; choose an early variety or grow under cover. | — |
| Chives | Feb 26 | May 28–Jun 4 | 132 | fits: 90 days to maturity, 132 available after May 28. | — |
| Dill | — | Mar 26–Jun 18 | 181 | two-plantings: Plant Mar 26 and again by Jul 16; both mature before Sep 23. | Jul 16 |
| Oregano | Mar 12 | May 28–Jun 4 | 132 | fits: 80 days to maturity, 132 available after May 28. | — |
| Rosemary | Feb 26 | May 28–Jun 4 | 118 | fits: 80 days to maturity, 118 available after May 28. | — |
| Sage | Mar 26 | May 28–Jun 4 | 132 | fits: 75 days to maturity, 132 available after May 28. | — |
| Thyme | Mar 12 | May 28–Jun 4 | 132 | fits: 90 days to maturity, 132 available after May 28. | — |
| Calendula | Apr 9 | May 7–May 21 | 139 | two-plantings: Plant May 7 and again by Jul 21; both mature before Sep 23. | Jul 21 |
| Cosmos | Apr 23 | May 21–Jun 4 | 104 | fits: 60 days to maturity, 104 available after May 21. | Jun 20 |
| Lavender | Feb 26 | May 21–Jun 4 | 139 | fits: 90 days to maturity, 139 available after May 21. | — |
| Marigolds | Apr 9 | May 21–May 28 | 104 | fits: 50 days to maturity, 104 available after May 21. | Jun 30 |
| Melons | May 7 | Jun 4–Jun 11 | 76 | head-start: Even planted out Jun 4, the outdoor season is about 9 days short; choose an early variety or grow under cover. | — |
| Mint | — | May 21–Jun 4 | 139 | fits: 90 days to maturity, 139 available after May 21. | — |
| Nasturtiums | Apr 23 | May 21–May 28 | 104 | fits: 55 days to maturity, 104 available after May 21. | Jun 25 |
| Pole Beans | — | May 28–Jun 11 | 97 | fits: 65 days to maturity, 97 available after May 28. | Jun 15 |
| Spaghetti Squash | May 7 | Jun 4–Jun 11 | 83 | head-start: Even planted out Jun 4, the outdoor season is about 7 days short; choose an early variety or grow under cover. | — |
| Sunflowers | — | May 21–Jun 4 | 104 | fits: 70 days to maturity, 104 available after May 21. | Jun 10 |
| Tomatillos | Mar 26 | May 28–Jun 4 | 83 | fits: 75 days to maturity, 83 available after May 28. | — |
| Watermelon | May 7 | May 28–Jun 4 | 83 | fits: 80 days to maturity, 83 available after May 28. | — |
| Yellow Squash | May 7 | Jun 4–Jun 11 | 90 | fits: 55 days to maturity, 90 available after Jun 4. | Jun 25 |
| Zinnias | Apr 23 | May 21–Jun 4 | 104 | fits: 60 days to maturity, 104 available after May 21. | Jun 20 |
Month by month in Powell
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start indoors: Chives (Feb 26), Lavender (Feb 26), Onion (Feb 26), Rosemary (Feb 26). |
| March | Start indoors: Celery (Mar 12), Collards (Mar 12), Kale (Mar 12), Oregano (Mar 12), Parsley (Mar 12), Scallions (Mar 12), +8 more. Direct sow from: Arugula (Mar 26), Beets (Mar 26), Dill (Mar 26), Peas (Mar 26), Radish (Mar 26), Spinach (Mar 26). |
| April | Start indoors: Eggplant (Apr 2), Calendula (Apr 9), Cauliflower (Apr 9), Marigolds (Apr 9), Pepper (Apr 9), Basil (Apr 16), +8 more. Direct sow from: Kohlrabi (Apr 9), Cilantro (Apr 23), Turnip (Apr 23), Carrots (Apr 30). Transplant from: Broccoli (Apr 23), Brussel Sprouts (Apr 23), Cabbage (Apr 23), Collards (Apr 23), Kale (Apr 23), Lettuce (Apr 23), +2 more. Plant: Strawberry (Apr 16). |
| May | Start indoors: Butternut Squash (May 7), Cantaloupe (May 7), Melons (May 7), Pumpkin (May 7), Spaghetti Squash (May 7), Watermelon (May 7), +2 more. Direct sow from: Potatoes (May 7), Sunflowers (May 21), Beans (May 28), Pole Beans (May 28). Transplant from: Calendula (May 7), Swiss Chard (May 7), Bok Choy (May 14), Cauliflower (May 14), Cosmos (May 21), Lavender (May 21), +15 more. Last frost around May 21. Last sowing dates: Corn (May 29). |
| June | Transplant from: Butternut Squash (Jun 4), Cantaloupe (Jun 4), Cucumber (Jun 4), Eggplant (Jun 4), Melons (Jun 4), Pepper (Jun 4), +6 more. Last sowing dates: Sunflowers (Jun 10), Brussel Sprouts (Jun 15), Pole Beans (Jun 15), Basil (Jun 20), Cosmos (Jun 20), Cucumber (Jun 20), +9 more. |
| July | Last sowing dates: Parsley (Jul 1), Peas (Jul 6), Cabbage (Jul 15), Carrots (Jul 15), Beets (Jul 16), Dill (Jul 16), +9 more. |
| August | Last sowing dates: Turnip (Aug 4), Arugula (Aug 14), Spinach (Aug 14), Radish (Aug 15). |
| September | Direct sow from: Garlic (Sep 16). First frost around September 16. |
| October | Last sowing dates: Garlic (Oct 7). |
| 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 Powell, WY (ZIP 82435)?
The median last spring frost date for Powell, WY (ZIP code 82435) is around May 21. 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 May 5; one in ten it runs past June 7.
What is the first fall frost date in Powell, WY?
The median first fall frost date for Powell, WY is around September 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 September 4 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Powell, WY?
The frost-free growing season in Powell is about 118 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 Powell (118 frost-free days, a short season), 33 of 56 planner crops fit outright, 15 get two plantings, 7 need an indoor start, 1 crop is perennial.
What USDA hardiness zone is Powell, WY?
Powell, WY is in USDA hardiness zone 5a (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 Powell, WY?
Start tomatoes indoors Apr 16 and plant out Jun 4 in Powell. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Powell?
Two: plant Apr 23 and again by Jul 26; both mature before Sep 23.
When do I plant garlic in Powell?
Sep 16 to Oct 7; it overwinters and is ready the following summer.
Can I grow Celery in Powell?
Yes, with help. Even planted out May 28, the outdoor season is about 2 days short; choose an early variety or grow under cover.
Which nearby ZIP has a longer season?
Cody (ZIP 82414) has 127 frost-free days, 9 more than Powell (ZIP 82435). See Cody ZIP 82414 frost dates
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- When to plant in WY
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