Frost dates for 82201Wheatland, WY
The average last spring frost in Wheatland is May 19 and the average first fall frost is September 22, giving a typical growing season of about 125 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 19
- Average first fall frost
- Sep 22
- Growing season
- 125 days
Safer after Jun 2 (1-in-10 risk)
Possible by Sep 8 (1-in-10 risk)
Last frost typically in 204 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | May 18 · Jun 1 · Jun 20 | Aug 28 · Sep 12 · Sep 26 | 102 days | 100% |
| Frost / freeze (32°F) | May 7 · May 19 · Jun 2 | Sep 8 · Sep 22 · Oct 4 | 125 days | 100% |
| Hard freeze (28°F) | Apr 27 · May 9 · May 22 | Sep 17 · Oct 1 · Oct 14 | 143 days | 100% |
Planting calendar for Wheatland
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Apr 18 – Jun 24 |
| Tomatoes | Transplant outdoors | Jun 4 – Jun 2 |
| Peppers | Start seeds indoors | Apr 18 – May 19 |
| Peppers | Transplant outdoors | Jun 18 – Jul 19 |
| Eggplant | Start seeds indoors | May 5 – Jun 3 |
| Eggplant | Transplant outdoors | Jun 18 – Jul 19 |
| Cucumbers | Sow outdoors | Jun 18 – Jun 12 |
| Summer squash | Sow outdoors | Jun 4 – Jul 19 |
| Winter squash & pumpkins | Sow outdoors | Jun 18 – Jul 19 |
| Snap beans | Sow outdoors | Jun 4 – Jul 5 |
| Sweet corn | Sow outdoors | Jun 4 – Jun 2 |
| Watermelon & cantaloupe | Sow outdoors | Jun 18 – Jul 19 |
| Okra | Sow outdoors | Jun 11 – Jul 4 |
| Peas | Sow outdoors (spring) | Apr 18 – Jun 3 |
| Potatoes | Plant outdoors (spring) | Apr 18 – Jun 18 |
| Onions | Start seeds indoors (spring) | Mar 7 – Apr 3 |
| Onions | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (spring) | Mar 31 – May 4 |
| Broccoli | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (fall) | May 23 – Jun 2 |
| Broccoli | Transplant outdoors (fall) | Jun 22 – Jul 3 |
| Cabbage | Start seeds indoors (spring) | Mar 21 – Apr 18 |
| Cabbage | Transplant outdoors (spring) | Apr 18 – May 19 |
| Cabbage | Start seeds indoors (fall) | May 13 – Jun 12 |
| Cabbage | Transplant outdoors (fall) | Jun 12 – Jul 13 |
| Leaf lettuce | Sow outdoors (spring) | Apr 18 – Jul 4 |
| Leaf lettuce | Sow outdoors (fall) | Jun 12 – Jul 29 |
| Spinach | Sow outdoors (spring) | Apr 11 – May 25 |
| Spinach | Sow outdoors (fall) | Jun 29 – Aug 3 |
| Radishes | Sow outdoors (spring) | Apr 18 – Jun 8 |
| Radishes | Sow outdoors (fall) | Jun 12 – Aug 13 |
| Kale | Sow outdoors (spring) | May 5 – May 25 |
| Kale | Sow outdoors (fall) | Jun 5 – Jul 13 |
| Carrots | Sow outdoors (spring) | May 19 – Jul 4 |
| Carrots | Sow outdoors (fall) | May 13 – Jun 28 |
| Garlic | Plant outdoors (fall) | Sep 12 – Oct 13 |
Where these dates come from
ZIP code 82201 is matched to the NOAA station Wheatland 4 N, WY, 7 km away, at 4,638 ft elevation (149 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Wheatland 4 N, WY (used) | 4,638 ft | May 19 | Sep 22 |
| Guernsey 2Nw, WY | 4,480 ft | May 7 | Oct 6 |
| Guernsey Dam #2, WY | 4,355 ft | May 11 | Oct 3 |
| Chugwater, WY | 5,304 ft | May 18 | Sep 24 |
Frost dates near Wheatland
- Guernsey, WY 82214 · last May 11, first Oct 3
- Chugwater, WY 82210 · last May 18, first Sep 24
- Hartville, WY 82215 · last May 7, first Oct 6
- Fort Laramie, WY 82212 · last May 14, first Sep 26
- Veteran, WY 82243 · last May 15, first Sep 27
- Glendo, WY 82213 · last May 9, first Oct 5
- Yoder, WY 82244 · last May 15, first Sep 27
- Lingle, WY 82223 · last May 11, first Sep 29
Frequently asked questions
- When is the last frost in Wheatland, WY?
- For ZIP code 82201, the average last spring frost (32°F) is May 19, based on NOAA 1991-2020 climate normals for the Wheatland 4 N, WY weather station. There is a 1-in-10 chance of a frost after June 2.
- When is the first frost in Wheatland, WY?
- The average first fall frost (32°F) is September 22. There is a 1-in-10 chance of frost by September 8, so tender plants are at risk from that point on.
- How long is the growing season in 82201?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 125 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.