Frost dates for 84007Bluebell, UT
The average last spring frost in Bluebell is May 31 and the average first fall frost is September 23, giving a typical growing season of about 112 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 31
- Average first fall frost
- Sep 23
- Growing season
- 112 days
Safer after Jun 16 (1-in-10 risk)
Possible by Sep 6 (1-in-10 risk)
Last frost typically in 216 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 30 · Jun 13 · Jun 29 | Sep 1 · Sep 15 · Sep 26 | 91 days | 100% |
| Frost / freeze (32°F) | May 16 · May 31 · Jun 16 | Sep 6 · Sep 23 · Oct 5 | 112 days | 100% |
| Hard freeze (28°F) | May 1 · May 17 · Jun 4 | Sep 17 · Oct 1 · Oct 16 | 136 days | 100% |
Planting calendar for Bluebell
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 – Jun 3 |
| 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 13 |
| Summer squash | Sow outdoors | Jun 16 – Jul 31 |
| Winter squash & pumpkins | Sow outdoors | Jun 30 – Jul 31 |
| Snap beans | Sow outdoors | Jun 16 – Jul 6 |
| Sweet corn | Sow outdoors | Jun 16 – Jun 3 |
| 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 24 – Jun 3 |
| Broccoli | Transplant outdoors (fall) | Jun 23 – Jul 4 |
| Cabbage | Start seeds indoors (spring) | Apr 2 – Apr 30 |
| Cabbage | Transplant outdoors (spring) | Apr 30 – May 31 |
| Cabbage | Start seeds indoors (fall) | May 14 – Jun 13 |
| Cabbage | Transplant outdoors (fall) | Jun 13 – Jul 14 |
| Leaf lettuce | Sow outdoors (spring) | Apr 30 – Jul 16 |
| Leaf lettuce | Sow outdoors (fall) | Jun 13 – Jul 30 |
| Spinach | Sow outdoors (spring) | Apr 23 – Jun 6 |
| Spinach | Sow outdoors (fall) | Jun 30 – Aug 4 |
| Radishes | Sow outdoors (spring) | Apr 30 – Jun 20 |
| Radishes | Sow outdoors (fall) | Jun 13 – Aug 14 |
| Kale | Sow outdoors (spring) | May 17 – Jun 6 |
| Kale | Sow outdoors (fall) | Jun 6 – Jul 14 |
| Carrots | Sow outdoors (spring) | May 31 – Jul 16 |
| Carrots | Sow outdoors (fall) | May 14 – Jun 29 |
| Garlic | Plant outdoors (fall) | Sep 13 – Oct 14 |
Where these dates come from
ZIP code 84007 is matched to the NOAA station Altamont, UT, 6.9 km away, at 6,456 ft elevation (252 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Altamont, UT (used) | 6,456 ft | May 31 | Sep 23 |
| Neola, UT | 5,950 ft | May 19 | Sep 29 |
| Myton, UT | 5,085 ft | May 7 | Oct 5 |
| Roosevelt Radio, UT | 5,014 ft | May 23 | Sep 22 |
Frost dates near Bluebell
- Altamont, UT 84001 · last May 31, first Sep 23
- Altonah, UT 84002 · last May 31, first Sep 23
- Mountain Home, UT 84051 · last May 31, first Sep 23
- Roosevelt, UT 84066 · last May 23, first Sep 22
- Talmage, UT 84073 · last May 31, first Sep 23
- Neola, UT 84053 · last May 19, first Sep 29
- Myton, UT 84052 · last May 7, first Oct 5
- Duchesne, UT 84021 · last May 6, first Oct 5
Frequently asked questions
- When is the last frost in Bluebell, UT?
- For ZIP code 84007, the average last spring frost (32°F) is May 31, based on NOAA 1991-2020 climate normals for the Altamont, UT weather station. There is a 1-in-10 chance of a frost after June 16.
- When is the first frost in Bluebell, UT?
- The average first fall frost (32°F) is September 23. 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 84007?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 112 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.