Frost dates for 82059Granite Canon, WY
The average last spring frost in Granite Canon is May 31 and the average first fall frost is September 19, giving a typical growing season of about 110 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 31
- Average first fall frost
- Sep 19
- Growing season
- 110 days
Safer after Jun 15 (1-in-10 risk)
Possible by Sep 5 (1-in-10 risk)
Last frost typically in 216 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 31 · Jun 14 · Jun 30 | Aug 23 · Sep 8 · Sep 22 | 87 days | 100% |
| Frost / freeze (32°F) | May 17 · May 31 · Jun 15 | Sep 5 · Sep 19 · Oct 1 | 110 days | 100% |
| Hard freeze (28°F) | May 3 · May 16 · May 31 | Sep 14 · Sep 29 · Oct 12 | 134 days | 100% |
Planting calendar for Granite Canon
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 30 – Jul 6 |
| Tomatoes | Transplant outdoors | Jun 16 – May 30 |
| Peppers | Start seeds indoors | Apr 30 – May 31 |
| Peppers | Transplant outdoors | Jun 30 – Jul 31 |
| Eggplant | Start seeds indoors | May 17 – Jun 15 |
| Eggplant | Transplant outdoors | Jun 30 – Jul 31 |
| Cucumbers | Sow outdoors | Jun 30 – Jun 9 |
| Summer squash | Sow outdoors | Jun 16 – Jul 31 |
| Winter squash & pumpkins | Sow outdoors | Jun 30 – Jul 31 |
| Snap beans | Sow outdoors | Jun 16 – Jul 2 |
| Sweet corn | Sow outdoors | Jun 16 – May 30 |
| Watermelon & cantaloupe | Sow outdoors | Jun 30 – Jul 31 |
| Okra | Sow outdoors | Jun 23 – Jul 16 |
| Peas | Sow outdoors (spring) | Apr 30 – Jun 15 |
| Potatoes | Plant outdoors (spring) | Apr 30 – Jun 30 |
| Onions | Start seeds indoors (spring) | Mar 19 – Apr 15 |
| Onions | Transplant outdoors (spring) | May 17 – Jun 15 |
| Broccoli | Start seeds indoors (spring) | Apr 12 – May 16 |
| Broccoli | Transplant outdoors (spring) | May 17 – Jun 15 |
| Broccoli | Start seeds indoors (fall) | May 20 – May 30 |
| Broccoli | Transplant outdoors (fall) | Jun 19 – Jun 30 |
| Cabbage | Start seeds indoors (spring) | Apr 2 – Apr 30 |
| Cabbage | Transplant outdoors (spring) | Apr 30 – May 31 |
| Cabbage | Start seeds indoors (fall) | May 10 – Jun 9 |
| Cabbage | Transplant outdoors (fall) | Jun 9 – Jul 10 |
| Leaf lettuce | Sow outdoors (spring) | Apr 30 – Jul 16 |
| Leaf lettuce | Sow outdoors (fall) | Jun 9 – Jul 26 |
| Spinach | Sow outdoors (spring) | Apr 23 – Jun 6 |
| Spinach | Sow outdoors (fall) | Jun 26 – Jul 31 |
| Radishes | Sow outdoors (spring) | Apr 30 – Jun 20 |
| Radishes | Sow outdoors (fall) | Jun 9 – Aug 10 |
| Kale | Sow outdoors (spring) | May 17 – Jun 6 |
| Kale | Sow outdoors (fall) | Jun 2 – Jul 10 |
| Carrots | Sow outdoors (spring) | May 31 – Jul 16 |
| Carrots | Sow outdoors (fall) | May 10 – Jun 25 |
| Garlic | Plant outdoors (fall) | Sep 9 – Oct 10 |
Where these dates come from
ZIP code 82059 is matched to the NOAA station Virginia Dale 7 Ene, CO, 10.7 km away, at 7,015 ft elevation (232 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Virginia Dale 7 Ene, CO (used) | 7,015 ft | May 31 | Sep 19 |
| Hecla 1E, WY | 6,690 ft | May 27 | Sep 19 |
| Cheyenne Wfo, WY | 6,119 ft | May 14 | Oct 1 |
| Cheyenne, WY | 6,128 ft | May 12 | Oct 1 |
Frost dates near Granite Canon
- Buford, WY 82052 · last May 31, first Sep 19
- Tie Siding, WY 82084 · last —, first —
- Fe Warren Afb, WY 82005 · last May 12, first Oct 1
- Livermore, CO 80536 · last May 31, first Sep 19
- Cheyenne, WY 82007 · last May 14, first Oct 1
- Carr, CO 80612 · last May 13, first Sep 27
- Wellington, CO 80549 · last May 2, first Oct 7
- Horse Creek, WY 82061 · last May 27, first Sep 19
Frequently asked questions
- When is the last frost in Granite Canon, WY?
- For ZIP code 82059, the average last spring frost (32°F) is May 31, based on NOAA 1991-2020 climate normals for the Virginia Dale 7 Ene, CO weather station. There is a 1-in-10 chance of a frost after June 15.
- When is the first frost in Granite Canon, WY?
- The average first fall frost (32°F) is September 19. There is a 1-in-10 chance of frost by September 5, so tender plants are at risk from that point on.
- How long is the growing season in 82059?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 110 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.