Frost dates for 82934Granger, WY
The average last spring frost in Granger is May 24 and the average first fall frost is September 22, giving a typical growing season of about 120 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 24
- Average first fall frost
- Sep 22
- Growing season
- 120 days
Safer after Jun 10 (1-in-10 risk)
Possible by Sep 7 (1-in-10 risk)
Last frost typically in 209 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 22 · Jun 7 · Jun 21 | Sep 1 · Sep 13 · Sep 25 | 96 days | 100% |
| Frost / freeze (32°F) | May 7 · May 24 · Jun 10 | Sep 7 · Sep 22 · Oct 6 | 120 days | 100% |
| Hard freeze (28°F) | Apr 25 · May 9 · May 28 | Sep 18 · Oct 3 · Oct 18 | 146 days | 100% |
Planting calendar for Granger
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 23 – Jun 29 |
| Tomatoes | Transplant outdoors | Jun 9 – Jun 2 |
| Peppers | Start seeds indoors | Apr 23 – May 24 |
| Peppers | Transplant outdoors | Jun 23 – Jul 24 |
| Eggplant | Start seeds indoors | May 10 – Jun 8 |
| Eggplant | Transplant outdoors | Jun 23 – Jul 24 |
| Cucumbers | Sow outdoors | Jun 23 – Jun 12 |
| Summer squash | Sow outdoors | Jun 9 – Jul 24 |
| Winter squash & pumpkins | Sow outdoors | Jun 23 – Jul 24 |
| Snap beans | Sow outdoors | Jun 9 – Jul 5 |
| Sweet corn | Sow outdoors | Jun 9 – Jun 2 |
| Watermelon & cantaloupe | Sow outdoors | Jun 23 – Jul 24 |
| Okra | Sow outdoors | Jun 16 – Jul 9 |
| Peas | Sow outdoors (spring) | Apr 23 – Jun 8 |
| Potatoes | Plant outdoors (spring) | Apr 23 – Jun 23 |
| Onions | Start seeds indoors (spring) | Mar 12 – Apr 8 |
| Onions | Transplant outdoors (spring) | May 10 – Jun 8 |
| Broccoli | Start seeds indoors (spring) | Apr 5 – May 9 |
| Broccoli | Transplant outdoors (spring) | May 10 – Jun 8 |
| Broccoli | Start seeds indoors (fall) | May 23 – Jun 2 |
| Broccoli | Transplant outdoors (fall) | Jun 22 – Jul 3 |
| Cabbage | Start seeds indoors (spring) | Mar 26 – Apr 23 |
| Cabbage | Transplant outdoors (spring) | Apr 23 – May 24 |
| Cabbage | Start seeds indoors (fall) | May 13 – Jun 12 |
| Cabbage | Transplant outdoors (fall) | Jun 12 – Jul 13 |
| Leaf lettuce | Sow outdoors (spring) | Apr 23 – Jul 9 |
| Leaf lettuce | Sow outdoors (fall) | Jun 12 – Jul 29 |
| Spinach | Sow outdoors (spring) | Apr 16 – May 30 |
| Spinach | Sow outdoors (fall) | Jun 29 – Aug 3 |
| Radishes | Sow outdoors (spring) | Apr 23 – Jun 13 |
| Radishes | Sow outdoors (fall) | Jun 12 – Aug 13 |
| Kale | Sow outdoors (spring) | May 10 – May 30 |
| Kale | Sow outdoors (fall) | Jun 5 – Jul 13 |
| Carrots | Sow outdoors (spring) | May 24 – Jul 9 |
| Carrots | Sow outdoors (fall) | May 13 – Jun 28 |
| Garlic | Plant outdoors (fall) | Sep 12 – Oct 13 |
Where these dates come from
ZIP code 82934 is matched to the NOAA station Green Rvr, WY, 42.4 km away, at 6,160 ft elevation (113 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Green Rvr, WY (used) | 6,160 ft | May 24 | Sep 22 |
| Church Buttes Gas Plt, WY | 7,079 ft | May 25 | Sep 27 |
| Fontenelle Dam, WY | 6,485 ft | — | — |
| Mtn View, WY | 6,800 ft | Jun 14 | Sep 9 |
Frost dates near Granger
- Little America, WY 82929 · last May 24, first Sep 22
- Opal, WY 83124 · last —, first —
- Lyman, WY 82937 · last Jun 14, first Sep 9
- Green River, WY 82935 · last May 24, first Sep 22
- Fort Bridger, WY 82933 · last Jun 14, first Sep 9
- Mountain View, WY 82939 · last Jun 14, first Sep 9
- Kemmerer, WY 83101 · last —, first —
- Diamondville, WY 83116 · last —, first —
Frequently asked questions
- When is the last frost in Granger, WY?
- For ZIP code 82934, the average last spring frost (32°F) is May 24, based on NOAA 1991-2020 climate normals for the Green Rvr, WY weather station. There is a 1-in-10 chance of a frost after June 10.
- When is the first frost in Granger, WY?
- The average first fall frost (32°F) is September 22. There is a 1-in-10 chance of frost by September 7, so tender plants are at risk from that point on.
- How long is the growing season in 82934?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 120 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.