Frost dates for 82727Rozet, WY
The average last spring frost in Rozet is May 22 and the average first fall frost is September 25, giving a typical growing season of about 125 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 22
- Average first fall frost
- Sep 25
- Growing season
- 125 days
Safer after Jun 4 (1-in-10 risk)
Possible by Sep 9 (1-in-10 risk)
Last frost typically in 200 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 21 · Jun 3 · Jun 18 | Sep 1 · Sep 15 · Sep 29 | 101 days | 100% |
| Frost / freeze (32°F) | May 8 · May 22 · Jun 4 | Sep 9 · Sep 25 · Oct 8 | 125 days | 100% |
| Hard freeze (28°F) | Apr 24 · May 9 · May 22 | Sep 20 · Oct 4 · Oct 18 | 148 days | 100% |
Planting calendar for Rozet
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 21 – Jun 27 |
| Tomatoes | Transplant outdoors | Jun 7 – Jun 5 |
| Peppers | Start seeds indoors | Apr 21 – May 22 |
| Peppers | Transplant outdoors | Jun 21 – Jul 22 |
| Eggplant | Start seeds indoors | May 8 – Jun 6 |
| Eggplant | Transplant outdoors | Jun 21 – Jul 22 |
| Cucumbers | Sow outdoors | Jun 21 – Jun 15 |
| Summer squash | Sow outdoors | Jun 7 – Jul 22 |
| Winter squash & pumpkins | Sow outdoors | Jun 21 – Jul 22 |
| Snap beans | Sow outdoors | Jun 7 – Jul 8 |
| Sweet corn | Sow outdoors | Jun 7 – Jun 5 |
| Watermelon & cantaloupe | Sow outdoors | Jun 21 – Jul 22 |
| Okra | Sow outdoors | Jun 14 – Jul 7 |
| Peas | Sow outdoors (spring) | Apr 21 – Jun 6 |
| Potatoes | Plant outdoors (spring) | Apr 21 – Jun 21 |
| Onions | Start seeds indoors (spring) | Mar 10 – Apr 6 |
| Onions | Transplant outdoors (spring) | May 8 – Jun 6 |
| Broccoli | Start seeds indoors (spring) | Apr 3 – May 7 |
| Broccoli | Transplant outdoors (spring) | May 8 – Jun 6 |
| Broccoli | Start seeds indoors (fall) | May 26 – Jun 5 |
| Broccoli | Transplant outdoors (fall) | Jun 25 – Jul 6 |
| Cabbage | Start seeds indoors (spring) | Mar 24 – Apr 21 |
| Cabbage | Transplant outdoors (spring) | Apr 21 – May 22 |
| Cabbage | Start seeds indoors (fall) | May 16 – Jun 15 |
| Cabbage | Transplant outdoors (fall) | Jun 15 – Jul 16 |
| Leaf lettuce | Sow outdoors (spring) | Apr 21 – Jul 7 |
| Leaf lettuce | Sow outdoors (fall) | Jun 15 – Aug 1 |
| Spinach | Sow outdoors (spring) | Apr 14 – May 28 |
| Spinach | Sow outdoors (fall) | Jul 2 – Aug 6 |
| Radishes | Sow outdoors (spring) | Apr 21 – Jun 11 |
| Radishes | Sow outdoors (fall) | Jun 15 – Aug 16 |
| Kale | Sow outdoors (spring) | May 8 – May 28 |
| Kale | Sow outdoors (fall) | Jun 8 – Jul 16 |
| Carrots | Sow outdoors (spring) | May 22 – Jul 7 |
| Carrots | Sow outdoors (fall) | May 16 – Jul 1 |
| Garlic | Plant outdoors (fall) | Sep 15 – Oct 16 |
Where these dates come from
ZIP code 82727 is matched to the NOAA station Gillette Campbell Ap, WY, 23.8 km away, at 4,354 ft elevation (13 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Gillette Campbell Ap, WY (used) | 4,354 ft | May 22 | Sep 25 |
| Gillette 4Se, WY | 4,640 ft | May 15 | Oct 1 |
| Dillinger, WY | 4,310 ft | May 25 | Sep 17 |
| Moorcroft 3S, WY | 4,325 ft | May 22 | Sep 28 |
Frost dates near Rozet
- Gillette, WY 82717 · last May 15, first Oct 1
- Moorcroft, WY 82721 · last May 21, first Sep 25
- Devils Tower, WY 82714 · last May 23, first Sep 20
- Weston, WY 82731 · last May 23, first Sep 18
- Upton, WY 82730 · last May 20, first Sep 23
- Wright, WY 82732 · last May 25, first Sep 23
- Recluse, WY 82725 · last May 21, first Sep 23
- Hulett, WY 82720 · last May 17, first Sep 23
Frequently asked questions
- When is the last frost in Rozet, WY?
- For ZIP code 82727, the average last spring frost (32°F) is May 22, based on NOAA 1991-2020 climate normals for the Gillette Campbell Ap, WY weather station. There is a 1-in-10 chance of a frost after June 4.
- When is the first frost in Rozet, WY?
- The average first fall frost (32°F) is September 25. 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 82727?
- 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.