Frost dates for 84756Newcastle, UT
The average last spring frost in Newcastle is May 31 and the average first fall frost is September 20, 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 20
- Growing season
- 110 days
Safer after Jun 20 (1-in-10 risk)
Possible by Sep 6 (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 28 · Jun 14 · Jul 5 | Aug 28 · Sep 10 · Sep 21 | 85 days | 100% |
| Frost / freeze (32°F) | May 16 · May 31 · Jun 20 | Sep 6 · Sep 20 · Oct 1 | 110 days | 100% |
| Hard freeze (28°F) | May 3 · May 17 · Jun 3 | Sep 15 · Sep 29 · Oct 12 | 134 days | 100% |
Planting calendar for Newcastle
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 31 |
| 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 10 |
| Summer squash | Sow outdoors | Jun 16 – Jul 31 |
| Winter squash & pumpkins | Sow outdoors | Jun 30 – Jul 31 |
| Snap beans | Sow outdoors | Jun 16 – Jul 3 |
| Sweet corn | Sow outdoors | Jun 16 – May 31 |
| 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 21 – May 31 |
| Broccoli | Transplant outdoors (fall) | Jun 20 – Jul 1 |
| Cabbage | Start seeds indoors (spring) | Apr 2 – Apr 30 |
| Cabbage | Transplant outdoors (spring) | Apr 30 – May 31 |
| Cabbage | Start seeds indoors (fall) | May 11 – Jun 10 |
| Cabbage | Transplant outdoors (fall) | Jun 10 – Jul 11 |
| Leaf lettuce | Sow outdoors (spring) | Apr 30 – Jul 16 |
| Leaf lettuce | Sow outdoors (fall) | Jun 10 – Jul 27 |
| Spinach | Sow outdoors (spring) | Apr 23 – Jun 6 |
| Spinach | Sow outdoors (fall) | Jun 27 – Aug 1 |
| Radishes | Sow outdoors (spring) | Apr 30 – Jun 20 |
| Radishes | Sow outdoors (fall) | Jun 10 – Aug 11 |
| Kale | Sow outdoors (spring) | May 17 – Jun 6 |
| Kale | Sow outdoors (fall) | Jun 3 – Jul 11 |
| Carrots | Sow outdoors (spring) | May 31 – Jul 16 |
| Carrots | Sow outdoors (fall) | May 11 – Jun 26 |
| Garlic | Plant outdoors (fall) | Sep 10 – Oct 11 |
Where these dates come from
ZIP code 84756 is matched to the NOAA station Enterprise Beryl Jct, UT, 9 km away, at 5,150 ft elevation (31 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Enterprise Beryl Jct, UT (used) | 5,150 ft | May 31 | Sep 20 |
| Enterprise, UT | 5,320 ft | May 21 | Oct 2 |
| Modena, UT | 5,460 ft | May 20 | Oct 3 |
| Veyo Powerhouse, UT | 4,600 ft | Apr 9 | Nov 5 |
Frost dates near Newcastle
- Enterprise, UT 84725 · last May 21, first Oct 2
- Beryl, UT 84714 · last May 31, first Sep 20
- Modena, UT 84753 · last May 20, first Oct 3
- Central, UT 84722 · last May 9, first Oct 11
- Pine Valley, UT 84781 · last May 4, first Oct 13
- Veyo, UT 84782 · last Apr 9, first Nov 5
- New Harmony, UT 84757 · last May 9, first Oct 11
- Kanarraville, UT 84742 · last May 21, first Sep 29
Frequently asked questions
- When is the last frost in Newcastle, UT?
- For ZIP code 84756, the average last spring frost (32°F) is May 31, based on NOAA 1991-2020 climate normals for the Enterprise Beryl Jct, UT weather station. There is a 1-in-10 chance of a frost after June 20.
- When is the first frost in Newcastle, UT?
- The average first fall frost (32°F) is September 20. There is a 1-in-10 chance of frost by September 6, so tender plants are at risk from that point on.
- How long is the growing season in 84756?
- 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.