Frost dates for 82210Chugwater, WY
The average last spring frost in Chugwater is May 18 and the average first fall frost is September 24, giving a typical growing season of about 129 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 18
- Average first fall frost
- Sep 24
- Growing season
- 129 days
Safer after Jun 2 (1-in-10 risk)
Possible by Sep 9 (1-in-10 risk)
Last frost typically in 203 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 19 · Jun 1 · Jun 15 | Sep 2 · Sep 15 · Sep 29 | 108 days | 100% |
| Frost / freeze (32°F) | May 5 · May 18 · Jun 2 | Sep 9 · Sep 24 · Oct 8 | 129 days | 100% |
| Hard freeze (28°F) | Apr 24 · May 7 · May 23 | Sep 19 · Oct 4 · Oct 18 | 150 days | 100% |
Planting calendar for Chugwater
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 17 – Jun 23 |
| Tomatoes | Transplant outdoors | Jun 3 – Jun 4 |
| Peppers | Start seeds indoors | Apr 17 – May 18 |
| Peppers | Transplant outdoors | Jun 17 – Jul 18 |
| Eggplant | Start seeds indoors | May 4 – Jun 2 |
| Eggplant | Transplant outdoors | Jun 17 – Jul 18 |
| Cucumbers | Sow outdoors | Jun 17 – Jun 14 |
| Summer squash | Sow outdoors | Jun 3 – Jul 18 |
| Winter squash & pumpkins | Sow outdoors | Jun 17 – Jul 18 |
| Snap beans | Sow outdoors | Jun 3 – Jul 7 |
| Sweet corn | Sow outdoors | Jun 3 – Jun 4 |
| Watermelon & cantaloupe | Sow outdoors | Jun 17 – Jul 18 |
| Okra | Sow outdoors | Jun 10 – Jul 3 |
| Peas | Sow outdoors (spring) | Apr 17 – Jun 2 |
| Potatoes | Plant outdoors (spring) | Apr 17 – Jun 17 |
| Onions | Start seeds indoors (spring) | Mar 6 – Apr 2 |
| Onions | Transplant outdoors (spring) | May 4 – Jun 2 |
| Broccoli | Start seeds indoors (spring) | Mar 30 – May 3 |
| Broccoli | Transplant outdoors (spring) | May 4 – Jun 2 |
| Broccoli | Start seeds indoors (fall) | May 25 – Jun 4 |
| Broccoli | Transplant outdoors (fall) | Jun 24 – Jul 5 |
| Cabbage | Start seeds indoors (spring) | Mar 20 – Apr 17 |
| Cabbage | Transplant outdoors (spring) | Apr 17 – May 18 |
| Cabbage | Start seeds indoors (fall) | May 15 – Jun 14 |
| Cabbage | Transplant outdoors (fall) | Jun 14 – Jul 15 |
| Leaf lettuce | Sow outdoors (spring) | Apr 17 – Jul 3 |
| Leaf lettuce | Sow outdoors (fall) | Jun 14 – Jul 31 |
| Spinach | Sow outdoors (spring) | Apr 10 – May 24 |
| Spinach | Sow outdoors (fall) | Jul 1 – Aug 5 |
| Radishes | Sow outdoors (spring) | Apr 17 – Jun 7 |
| Radishes | Sow outdoors (fall) | Jun 14 – Aug 15 |
| Kale | Sow outdoors (spring) | May 4 – May 24 |
| Kale | Sow outdoors (fall) | Jun 7 – Jul 15 |
| Carrots | Sow outdoors (spring) | May 18 – Jul 3 |
| Carrots | Sow outdoors (fall) | May 15 – Jun 30 |
| Garlic | Plant outdoors (fall) | Sep 14 – Oct 15 |
Where these dates come from
ZIP code 82210 is matched to the NOAA station Chugwater, WY, 1.2 km away, at 5,304 ft elevation (1 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Chugwater, WY (used) | 5,304 ft | May 18 | Sep 24 |
| Phillips, WY | 4,982 ft | May 21 | Sep 21 |
| Yoder 5 W, WY | 4,330 ft | May 15 | Sep 27 |
| Wheatland 4 N, WY | 4,638 ft | May 19 | Sep 22 |
Frost dates near Chugwater
- Wheatland, WY 82201 · last May 19, first Sep 22
- Yoder, WY 82244 · last May 15, first Sep 27
- Horse Creek, WY 82061 · last May 27, first Sep 19
- Veteran, WY 82243 · last May 15, first Sep 27
- Hawk Springs, WY 82217 · last May 15, first Sep 27
- Meriden, WY 82081 · last May 21, first Sep 21
- Lagrange, WY 82221 · last May 14, first Oct 1
- Fort Laramie, WY 82212 · last May 14, first Sep 26
Frequently asked questions
- When is the last frost in Chugwater, WY?
- For ZIP code 82210, the average last spring frost (32°F) is May 18, based on NOAA 1991-2020 climate normals for the Chugwater, WY weather station. There is a 1-in-10 chance of a frost after June 2.
- When is the first frost in Chugwater, WY?
- The average first fall frost (32°F) is September 24. There is a 1-in-10 chance of frost by September 9, so tender plants are at risk from that point on.
- How long is the growing season in 82210?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 129 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.