Frost dates for 84623Chester, UT
The average last spring frost in Chester is May 26 and the average first fall frost is September 25, giving a typical growing season of about 119 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 26
- Average first fall frost
- Sep 25
- Growing season
- 119 days
Safer after Jun 13 (1-in-10 risk)
Possible by Sep 9 (1-in-10 risk)
Last frost typically in 211 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 27 · Jun 10 · Jun 28 | Sep 1 · Sep 16 · Sep 27 | 94 days | 100% |
| Frost / freeze (32°F) | May 10 · May 26 · Jun 13 | Sep 9 · Sep 25 · Oct 8 | 119 days | 100% |
| Hard freeze (28°F) | Apr 25 · May 10 · May 30 | Sep 21 · Oct 5 · Oct 20 | 147 days | 100% |
Planting calendar for Chester
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 25 – Jul 1 |
| Tomatoes | Transplant outdoors | Jun 11 – Jun 5 |
| Peppers | Start seeds indoors | Apr 25 – May 26 |
| Peppers | Transplant outdoors | Jun 25 – Jul 26 |
| Eggplant | Start seeds indoors | May 12 – Jun 10 |
| Eggplant | Transplant outdoors | Jun 25 – Jul 26 |
| Cucumbers | Sow outdoors | Jun 25 – Jun 15 |
| Summer squash | Sow outdoors | Jun 11 – Jul 26 |
| Winter squash & pumpkins | Sow outdoors | Jun 25 – Jul 26 |
| Snap beans | Sow outdoors | Jun 11 – Jul 8 |
| Sweet corn | Sow outdoors | Jun 11 – Jun 5 |
| Watermelon & cantaloupe | Sow outdoors | Jun 25 – Jul 26 |
| Okra | Sow outdoors | Jun 18 – Jul 11 |
| Peas | Sow outdoors (spring) | Apr 25 – Jun 10 |
| Potatoes | Plant outdoors (spring) | Apr 25 – Jun 25 |
| Onions | Start seeds indoors (spring) | Mar 14 – Apr 10 |
| Onions | Transplant outdoors (spring) | May 12 – Jun 10 |
| Broccoli | Start seeds indoors (spring) | Apr 7 – May 11 |
| Broccoli | Transplant outdoors (spring) | May 12 – Jun 10 |
| Broccoli | Start seeds indoors (fall) | May 26 – Jun 5 |
| Broccoli | Transplant outdoors (fall) | Jun 25 – Jul 6 |
| Cabbage | Start seeds indoors (spring) | Mar 28 – Apr 25 |
| Cabbage | Transplant outdoors (spring) | Apr 25 – May 26 |
| Cabbage | Start seeds indoors (fall) | May 16 – Jun 15 |
| Cabbage | Transplant outdoors (fall) | Jun 15 – Jul 16 |
| Leaf lettuce | Sow outdoors (spring) | Apr 25 – Jul 11 |
| Leaf lettuce | Sow outdoors (fall) | Jun 15 – Aug 1 |
| Spinach | Sow outdoors (spring) | Apr 18 – Jun 1 |
| Spinach | Sow outdoors (fall) | Jul 2 – Aug 6 |
| Radishes | Sow outdoors (spring) | Apr 25 – Jun 15 |
| Radishes | Sow outdoors (fall) | Jun 15 – Aug 16 |
| Kale | Sow outdoors (spring) | May 12 – Jun 1 |
| Kale | Sow outdoors (fall) | Jun 8 – Jul 16 |
| Carrots | Sow outdoors (spring) | May 26 – Jul 11 |
| Carrots | Sow outdoors (fall) | May 16 – Jul 1 |
| Garlic | Plant outdoors (fall) | Sep 15 – Oct 16 |
Where these dates come from
ZIP code 84623 is matched to the NOAA station Moroni, UT, 6 km away, at 5,580 ft elevation (65 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Moroni, UT (used) | 5,580 ft | May 26 | Sep 25 |
| Ephraim, UT | 5,498 ft | May 28 | Sep 20 |
| Manti Radio Kmti, UT | 5,498 ft | May 31 | Sep 21 |
| Manti, UT | 5,740 ft | May 11 | Oct 6 |
Frost dates near Chester
- Moroni, UT 84646 · last May 26, first Sep 25
- Wales, UT 84667 · last May 26, first Sep 25
- Mount Pleasant, UT 84647 · last May 26, first Sep 25
- Spring City, UT 84662 · last May 26, first Sep 25
- Ephraim, UT 84627 · last May 28, first Sep 20
- Fountain Green, UT 84632 · last May 26, first Sep 25
- Fairview, UT 84629 · last May 26, first Sep 25
- Manti, UT 84642 · last May 11, first Oct 6
Frequently asked questions
- When is the last frost in Chester, UT?
- For ZIP code 84623, the average last spring frost (32°F) is May 26, based on NOAA 1991-2020 climate normals for the Moroni, UT weather station. There is a 1-in-10 chance of a frost after June 13.
- When is the first frost in Chester, UT?
- The average first fall frost (32°F) is September 25. There is a 1-in-10 chance of frost by September 9, so tender plants are at risk from that point on.
- How long is the growing season in 84623?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 119 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.