Frost dates for 82055Centennial, WY
The average last spring frost in Centennial is June 2 and the average first fall frost is September 15, giving a typical growing season of about 102 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Jun 2
- Average first fall frost
- Sep 15
- Growing season
- 102 days
Safer after Jun 18 (1-in-10 risk)
Possible by Sep 3 (1-in-10 risk)
Last frost typically in 218 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) | Jun 2 · Jun 18 · Jul 4 | Aug 20 · Sep 4 · Sep 16 | 78 days | 100% |
| Frost / freeze (32°F) | May 21 · Jun 2 · Jun 18 | Sep 3 · Sep 15 · Sep 27 | 102 days | 100% |
| Hard freeze (28°F) | May 7 · May 20 · Jun 3 | Sep 10 · Sep 24 · Oct 6 | 125 days | 100% |
Planting calendar for Centennial
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 | May 2 – Jul 8 |
| Tomatoes | Transplant outdoors | Jun 18 – May 26 |
| Peppers | Start seeds indoors | May 2 – Jun 2 |
| Peppers | Transplant outdoors | Jul 2 – Aug 2 |
| Eggplant | Start seeds indoors | May 19 – Jun 17 |
| Eggplant | Transplant outdoors | Jul 2 – Aug 2 |
| Cucumbers | Sow outdoors | Jul 2 – Jun 5 |
| Summer squash | Sow outdoors | Jun 18 – Aug 2 |
| Winter squash & pumpkins | Sow outdoors | Jul 2 – Aug 2 |
| Snap beans | Sow outdoors | Jun 18 – Jun 28 |
| Sweet corn | Sow outdoors | Jun 18 – May 26 |
| Watermelon & cantaloupe | Sow outdoors | Jul 2 – Aug 2 |
| Okra | Sow outdoors | Jun 25 – Jul 18 |
| Peas | Sow outdoors (spring) | May 2 – Jun 17 |
| Potatoes | Plant outdoors (spring) | May 2 – Jul 2 |
| Onions | Start seeds indoors (spring) | Mar 21 – Apr 17 |
| Onions | Transplant outdoors (spring) | May 19 – Jun 17 |
| Broccoli | Start seeds indoors (spring) | Apr 14 – May 18 |
| Broccoli | Transplant outdoors (spring) | May 19 – Jun 17 |
| Broccoli | Start seeds indoors (fall) | May 16 – May 26 |
| Broccoli | Transplant outdoors (fall) | Jun 15 – Jun 26 |
| Cabbage | Start seeds indoors (spring) | Apr 4 – May 2 |
| Cabbage | Transplant outdoors (spring) | May 2 – Jun 2 |
| Cabbage | Start seeds indoors (fall) | May 6 – Jun 5 |
| Cabbage | Transplant outdoors (fall) | Jun 5 – Jul 6 |
| Leaf lettuce | Sow outdoors (spring) | May 2 – Jul 18 |
| Leaf lettuce | Sow outdoors (fall) | Jun 5 – Jul 22 |
| Spinach | Sow outdoors (spring) | Apr 25 – Jun 8 |
| Spinach | Sow outdoors (fall) | Jun 22 – Jul 27 |
| Radishes | Sow outdoors (spring) | May 2 – Jun 22 |
| Radishes | Sow outdoors (fall) | Jun 5 – Aug 6 |
| Kale | Sow outdoors (spring) | May 19 – Jun 8 |
| Kale | Sow outdoors (fall) | May 29 – Jul 6 |
| Carrots | Sow outdoors (spring) | Jun 2 – Jul 18 |
| Carrots | Sow outdoors (fall) | May 6 – Jun 21 |
| Garlic | Plant outdoors (fall) | Sep 5 – Oct 6 |
Where these dates come from
ZIP code 82055 is matched to the NOAA station Laramie Rgnl Ap, WY, 26.9 km away, at 7,266 ft elevation (267 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Laramie Rgnl Ap, WY (used) | 7,266 ft | Jun 2 | Sep 15 |
| Centennial 1Ne, WY | 8,170 ft | Jun 2 | Sep 19 |
| Laramie 2 Nw, WY | 7,140 ft | Jun 7 | Sep 4 |
| Laramie 4Se, WY | 7,390 ft | May 22 | Sep 28 |
Frost dates near Centennial
- Laramie, WY 82070 · last Jun 7, first Sep 4
- Jelm, WY 82063 · last —, first —
- Bosler, WY 82051 · last Jun 7, first Sep 4
- Rock River, WY 82083 · last Jun 1, first Sep 8
- Elk Mountain, WY 82324 · last May 28, first Sep 13
- Tie Siding, WY 82084 · last —, first —
- Red Feather Lakes, CO 80545 · last —, first —
- Cowdrey, CO 80434 · last —, first —
Frequently asked questions
- When is the last frost in Centennial, WY?
- For ZIP code 82055, the average last spring frost (32°F) is June 2, based on NOAA 1991-2020 climate normals for the Laramie Rgnl Ap, WY weather station. There is a 1-in-10 chance of a frost after June 18.
- When is the first frost in Centennial, WY?
- The average first fall frost (32°F) is September 15. There is a 1-in-10 chance of frost by September 3, so tender plants are at risk from that point on.
- How long is the growing season in 82055?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 102 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.