Frost dates for 84731Greenville, UT
The average last spring frost in Greenville is May 24 and the average first fall frost is September 25, giving a typical growing season of about 123 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 24
- Average first fall frost
- Sep 25
- Growing season
- 123 days
Safer after Jun 10 (1-in-10 risk)
Possible by Sep 11 (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 23 · Jun 6 · Jun 26 | Sep 1 · Sep 15 · Sep 27 | 98 days | 100% |
| Frost / freeze (32°F) | May 6 · May 24 · Jun 10 | Sep 11 · Sep 25 · Oct 6 | 123 days | 100% |
| Hard freeze (28°F) | Apr 22 · May 8 · May 27 | Sep 20 · Oct 3 · Oct 18 | 148 days | 100% |
Planting calendar for Greenville
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 5 |
| 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 15 |
| Summer squash | Sow outdoors | Jun 9 – Jul 24 |
| Winter squash & pumpkins | Sow outdoors | Jun 23 – Jul 24 |
| Snap beans | Sow outdoors | Jun 9 – Jul 8 |
| Sweet corn | Sow outdoors | Jun 9 – Jun 5 |
| 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 26 – Jun 5 |
| Broccoli | Transplant outdoors (fall) | Jun 25 – Jul 6 |
| Cabbage | Start seeds indoors (spring) | Mar 26 – Apr 23 |
| Cabbage | Transplant outdoors (spring) | Apr 23 – May 24 |
| Cabbage | Start seeds indoors (fall) | May 16 – Jun 15 |
| Cabbage | Transplant outdoors (fall) | Jun 15 – Jul 16 |
| Leaf lettuce | Sow outdoors (spring) | Apr 23 – Jul 9 |
| Leaf lettuce | Sow outdoors (fall) | Jun 15 – Aug 1 |
| Spinach | Sow outdoors (spring) | Apr 16 – May 30 |
| Spinach | Sow outdoors (fall) | Jul 2 – Aug 6 |
| Radishes | Sow outdoors (spring) | Apr 23 – Jun 13 |
| Radishes | Sow outdoors (fall) | Jun 15 – Aug 16 |
| Kale | Sow outdoors (spring) | May 10 – May 30 |
| Kale | Sow outdoors (fall) | Jun 8 – Jul 16 |
| Carrots | Sow outdoors (spring) | May 24 – Jul 9 |
| Carrots | Sow outdoors (fall) | May 16 – Jul 1 |
| Garlic | Plant outdoors (fall) | Sep 15 – Oct 16 |
Where these dates come from
ZIP code 84731 is matched to the NOAA station Marysvale, UT, 47.8 km away, at 5,845 ft elevation (173 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Marysvale, UT (used) | 5,845 ft | May 24 | Sep 25 |
| Beaver Canyon Pwr House, UT | 7,275 ft | Jun 1 | Sep 28 |
| Milford, UT | 5,009 ft | May 10 | Oct 2 |
| Milford Muni Ap, UT | 5,040 ft | May 13 | Oct 4 |
Frost dates near Greenville
- Beaver, UT 84713 · last May 23, first Sep 27
- Minersville, UT 84752 · last May 13, first Oct 4
- Milford, UT 84751 · last May 13, first Oct 4
- Paragonah, UT 84760 · last May 21, first Sep 29
- Circleville, UT 84723 · last May 23, first Sep 27
- Junction, UT 84740 · last May 23, first Sep 27
- Kingston, UT 84743 · last May 23, first Sep 27
- Marysvale, UT 84750 · last May 24, first Sep 25
Frequently asked questions
- When is the last frost in Greenville, UT?
- For ZIP code 84731, the average last spring frost (32°F) is May 24, based on NOAA 1991-2020 climate normals for the Marysvale, UT weather station. There is a 1-in-10 chance of a frost after June 10.
- When is the first frost in Greenville, UT?
- The average first fall frost (32°F) is September 25. There is a 1-in-10 chance of frost by September 11, so tender plants are at risk from that point on.
- How long is the growing season in 84731?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 123 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.