Frost dates for 81092Wiley, CO
The average last spring frost in Wiley is May 2 and the average first fall frost is October 7, giving a typical growing season of about 157 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 2
- Average first fall frost
- Oct 7
- Growing season
- 157 days
Safer after May 17 (1-in-10 risk)
Possible by Sep 28 (1-in-10 risk)
Last frost typically in 182 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) | Apr 30 · May 13 · May 28 | Sep 21 · Oct 1 · Oct 11 | 140 days | 100% |
| Frost / freeze (32°F) | Apr 19 · May 2 · May 17 | Sep 28 · Oct 7 · Oct 19 | 157 days | 100% |
| Hard freeze (28°F) | Apr 7 · Apr 22 · May 6 | Oct 4 · Oct 16 · Oct 27 | 176 days | 100% |
Planting calendar for Wiley
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 1 – Jun 7 |
| Tomatoes | Transplant outdoors | May 18 – Jun 17 |
| Peppers | Start seeds indoors | Apr 1 – May 2 |
| Peppers | Transplant outdoors | Jun 1 – Jul 2 |
| Eggplant | Start seeds indoors | Apr 18 – May 17 |
| Eggplant | Transplant outdoors | Jun 1 – Jul 2 |
| Cucumbers | Sow outdoors | Jun 1 – Jun 27 |
| Summer squash | Sow outdoors | May 18 – Jul 2 |
| Winter squash & pumpkins | Sow outdoors | Jun 1 – Jul 2 |
| Snap beans | Sow outdoors | May 18 – Jul 20 |
| Sweet corn | Sow outdoors | May 18 – Jun 17 |
| Watermelon & cantaloupe | Sow outdoors | Jun 1 – Jul 2 |
| Okra | Sow outdoors | May 25 – Jun 17 |
| Peas | Sow outdoors (spring) | Apr 1 – May 17 |
| Potatoes | Plant outdoors (spring) | Apr 1 – Jun 1 |
| Onions | Start seeds indoors (spring) | Feb 18 – Mar 17 |
| Onions | Transplant outdoors (spring) | Apr 18 – May 17 |
| Broccoli | Start seeds indoors (spring) | Mar 14 – Apr 17 |
| Broccoli | Transplant outdoors (spring) | Apr 18 – May 17 |
| Broccoli | Start seeds indoors (fall) | Jun 7 – Jun 17 |
| Broccoli | Transplant outdoors (fall) | Jul 7 – Jul 18 |
| Cabbage | Start seeds indoors (spring) | Mar 4 – Apr 1 |
| Cabbage | Transplant outdoors (spring) | Apr 1 – May 2 |
| Cabbage | Start seeds indoors (fall) | May 28 – Jun 27 |
| Cabbage | Transplant outdoors (fall) | Jun 27 – Jul 28 |
| Leaf lettuce | Sow outdoors (spring) | Apr 1 – Jun 17 |
| Leaf lettuce | Sow outdoors (fall) | Jun 27 – Aug 13 |
| Spinach | Sow outdoors (spring) | Mar 25 – May 8 |
| Spinach | Sow outdoors (fall) | Jul 14 – Aug 18 |
| Radishes | Sow outdoors (spring) | Apr 1 – May 22 |
| Radishes | Sow outdoors (fall) | Jun 27 – Aug 28 |
| Kale | Sow outdoors (spring) | Apr 18 – May 8 |
| Kale | Sow outdoors (fall) | Jun 20 – Jul 28 |
| Carrots | Sow outdoors (spring) | May 2 – Jun 17 |
| Carrots | Sow outdoors (fall) | May 28 – Jul 13 |
| Garlic | Plant outdoors (fall) | Sep 27 – Oct 28 |
Where these dates come from
ZIP code 81092 is matched to the NOAA station Lamar Muni Ap, CO, 10.2 km away, at 3,704 ft elevation (36 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Lamar Muni Ap, CO (used) | 3,704 ft | May 2 | Oct 7 |
| Lamar, CO | 3,627 ft | Apr 30 | Oct 10 |
| John Martin Dam, CO | 3,814 ft | Apr 24 | Oct 15 |
| Eads, CO | 4,212 ft | Apr 30 | Oct 13 |
Frost dates near Wiley
- Lamar, CO 81052 · last Apr 30, first Oct 10
- Mc Clave, CO 81057 · last Apr 24, first Oct 15
- Eads, CO 81036 · last Apr 30, first Oct 13
- Hasty, CO 81044 · last Apr 24, first Oct 15
- Granada, CO 81041 · last May 1, first Oct 12
- Fort Lyon, CO 81038 · last Apr 29, first Oct 12
- Las Animas, CO 81054 · last Apr 29, first Oct 12
- Hartman, CO 81043 · last May 1, first Oct 12
Frequently asked questions
- When is the last frost in Wiley, CO?
- For ZIP code 81092, the average last spring frost (32°F) is May 2, based on NOAA 1991-2020 climate normals for the Lamar Muni Ap, CO weather station. There is a 1-in-10 chance of a frost after May 17.
- When is the first frost in Wiley, CO?
- The average first fall frost (32°F) is October 7. There is a 1-in-10 chance of frost by September 28, so tender plants are at risk from that point on.
- How long is the growing season in 81092?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 157 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.