Frost dates for 84525Green River, UT
The average last spring frost in Green River is April 2 and the average first fall frost is October 30, giving a typical growing season of about 207 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 2
- Average first fall frost
- Oct 30
- Growing season
- 207 days
Safer after Apr 23 (1-in-10 risk)
Possible by Oct 12 (1-in-10 risk)
First frost typically in 3 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 1 · Apr 18 · May 9 | Oct 5 · Oct 20 · Nov 3 | 181 days | 100% |
| Frost / freeze (32°F) | Mar 10 · Apr 2 · Apr 23 | Oct 12 · Oct 30 · Nov 14 | 207 days | 100% |
| Hard freeze (28°F) | Feb 21 · Mar 10 · Apr 3 | Oct 22 · Nov 10 · Nov 22 | 242 days | 100% |
Planting calendar for Green River
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 | Mar 2 – May 8 |
| Tomatoes | Transplant outdoors | Apr 18 – Jul 10 |
| Peppers | Start seeds indoors | Mar 2 – Apr 2 |
| Peppers | Transplant outdoors | May 2 – Jun 2 |
| Eggplant | Start seeds indoors | Mar 19 – Apr 17 |
| Eggplant | Transplant outdoors | May 2 – Jun 2 |
| Cucumbers | Sow outdoors | May 2 – Jul 20 |
| Summer squash | Sow outdoors | Apr 18 – Jun 2 |
| Winter squash & pumpkins | Sow outdoors | May 2 – Jun 2 |
| Snap beans | Sow outdoors | Apr 18 – Aug 12 |
| Sweet corn | Sow outdoors | Apr 18 – Jul 10 |
| Watermelon & cantaloupe | Sow outdoors | May 2 – Jun 2 |
| Okra | Sow outdoors | Apr 25 – May 18 |
| Peas | Sow outdoors (spring) | Mar 2 – Apr 17 |
| Potatoes | Plant outdoors (spring) | Mar 2 – May 2 |
| Onions | Start seeds indoors (spring) | Jan 19 – Feb 15 |
| Onions | Transplant outdoors (spring) | Mar 19 – Apr 17 |
| Broccoli | Start seeds indoors (spring) | Feb 12 – Mar 18 |
| Broccoli | Transplant outdoors (spring) | Mar 19 – Apr 17 |
| Broccoli | Start seeds indoors (fall) | Jun 30 – Jul 10 |
| Broccoli | Transplant outdoors (fall) | Jul 30 – Aug 10 |
| Cabbage | Start seeds indoors (spring) | Feb 2 – Mar 2 |
| Cabbage | Transplant outdoors (spring) | Mar 2 – Apr 2 |
| Cabbage | Start seeds indoors (fall) | Jun 20 – Jul 20 |
| Cabbage | Transplant outdoors (fall) | Jul 20 – Aug 20 |
| Leaf lettuce | Sow outdoors (spring) | Mar 2 – May 18 |
| Leaf lettuce | Sow outdoors (fall) | Jul 20 – Sep 5 |
| Spinach | Sow outdoors (spring) | Feb 23 – Apr 8 |
| Spinach | Sow outdoors (fall) | Aug 6 – Sep 10 |
| Radishes | Sow outdoors (spring) | Mar 2 – Apr 22 |
| Radishes | Sow outdoors (fall) | Jul 20 – Sep 20 |
| Kale | Sow outdoors (spring) | Mar 19 – Apr 8 |
| Kale | Sow outdoors (fall) | Jul 13 – Aug 20 |
| Carrots | Sow outdoors (spring) | Apr 2 – May 18 |
| Carrots | Sow outdoors (fall) | Jun 20 – Aug 5 |
| Garlic | Plant outdoors (fall) | Oct 20 – Nov 20 |
Where these dates come from
ZIP code 84525 is matched to the NOAA station Arches Np Hqs, UT, 63.4 km away, at 4,093 ft elevation (25 ft higher than the ZIP code's center). This station is relatively far away, so local dates may differ more than usual. Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Arches Np Hqs, UT (used) | 4,093 ft | Apr 2 | Oct 30 |
| Moab Canyonland Ap, UT | 4,561 ft | Apr 22 | Oct 20 |
| Sunnyside City Ctr, UT | 6,530 ft | May 5 | Oct 15 |
| Sunnyside City, UT | 6,511 ft | Apr 26 | Oct 25 |
Frost dates near Green River
- Thompson, UT 84540 · last Apr 22, first Oct 20
- Sunnyside, UT 84539 · last May 5, first Oct 15
- East Carbon, UT 84520 · last May 5, first Oct 15
- Cleveland, UT 84518 · last May 18, first Sep 27
- Elmo, UT 84521 · last May 18, first Sep 27
- Cisco, UT 84515 · last Apr 27, first Oct 9
- Moab, UT 84532 · last Apr 11, first Oct 23
- Castle Dale, UT 84513 · last May 18, first Sep 27
Frequently asked questions
- When is the last frost in Green River, UT?
- For ZIP code 84525, the average last spring frost (32°F) is April 2, based on NOAA 1991-2020 climate normals for the Arches Np Hqs, UT weather station. There is a 1-in-10 chance of a frost after April 23.
- When is the first frost in Green River, UT?
- The average first fall frost (32°F) is October 30. There is a 1-in-10 chance of frost by October 12, so tender plants are at risk from that point on.
- How long is the growing season in 84525?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 207 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.