Frost dates for 84649Oak City, UT
The average last spring frost in Oak City is May 2 and the average first fall frost is October 13, giving a typical growing season of about 162 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 2
- Average first fall frost
- Oct 13
- Growing season
- 162 days
Safer after May 21 (1-in-10 risk)
Possible by Sep 30 (1-in-10 risk)
Last frost typically in 187 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 30 · May 16 · Jun 3 | Sep 21 · Oct 4 · Oct 19 | 138 days | 100% |
| Frost / freeze (32°F) | Apr 18 · May 2 · May 21 | Sep 30 · Oct 13 · Oct 30 | 162 days | 100% |
| Hard freeze (28°F) | Apr 5 · Apr 20 · May 9 | Oct 7 · Oct 24 · Nov 8 | 186 days | 100% |
Planting calendar for Oak City
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 1 – Jun 7 |
| Tomatoes | Transplant outdoors | May 18 – Jun 23 |
| Peppers | Start seeds indoors | Apr 1 – May 2 |
| Peppers | Transplant outdoors | Jun 1 – Jul 2 |
| Eggplant | Start seeds indoors | Apr 18 – May 17 |
| Eggplant | Transplant outdoors | Jun 1 – Jul 2 |
| Cucumbers | Sow outdoors | Jun 1 – Jul 3 |
| Summer squash | Sow outdoors | May 18 – Jul 2 |
| Winter squash & pumpkins | Sow outdoors | Jun 1 – Jul 2 |
| Snap beans | Sow outdoors | May 18 – Jul 26 |
| Sweet corn | Sow outdoors | May 18 – Jun 23 |
| Watermelon & cantaloupe | Sow outdoors | Jun 1 – Jul 2 |
| Okra | Sow outdoors | May 25 – Jun 17 |
| Peas | Sow outdoors (spring) | Apr 1 – May 17 |
| Potatoes | Plant outdoors (spring) | Apr 1 – Jun 1 |
| Onions | Start seeds indoors (spring) | Feb 18 – Mar 17 |
| Onions | Transplant outdoors (spring) | Apr 18 – May 17 |
| Broccoli | Start seeds indoors (spring) | Mar 14 – Apr 17 |
| Broccoli | Transplant outdoors (spring) | Apr 18 – May 17 |
| Broccoli | Start seeds indoors (fall) | Jun 13 – Jun 23 |
| Broccoli | Transplant outdoors (fall) | Jul 13 – Jul 24 |
| Cabbage | Start seeds indoors (spring) | Mar 4 – Apr 1 |
| Cabbage | Transplant outdoors (spring) | Apr 1 – May 2 |
| Cabbage | Start seeds indoors (fall) | Jun 3 – Jul 3 |
| Cabbage | Transplant outdoors (fall) | Jul 3 – Aug 3 |
| Leaf lettuce | Sow outdoors (spring) | Apr 1 – Jun 17 |
| Leaf lettuce | Sow outdoors (fall) | Jul 3 – Aug 19 |
| Spinach | Sow outdoors (spring) | Mar 25 – May 8 |
| Spinach | Sow outdoors (fall) | Jul 20 – Aug 24 |
| Radishes | Sow outdoors (spring) | Apr 1 – May 22 |
| Radishes | Sow outdoors (fall) | Jul 3 – Sep 3 |
| Kale | Sow outdoors (spring) | Apr 18 – May 8 |
| Kale | Sow outdoors (fall) | Jun 26 – Aug 3 |
| Carrots | Sow outdoors (spring) | May 2 – Jun 17 |
| Carrots | Sow outdoors (fall) | Jun 3 – Jul 19 |
| Garlic | Plant outdoors (fall) | Oct 3 – Nov 3 |
Where these dates come from
ZIP code 84649 is matched to the NOAA station Oak City, UT, 2.7 km away, at 5,095 ft elevation (69 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Oak City, UT (used) | 5,095 ft | May 2 | Oct 13 |
| Delta, UT | 4,620 ft | May 16 | Sep 29 |
| Scipio, UT | 5,314 ft | May 22 | Sep 25 |
| Deseret, UT | 4,590 ft | May 14 | Sep 30 |
Frost dates near Oak City
- Lynndyl, UT 84640 · last May 2, first Oct 13
- Delta, UT 84624 · last May 16, first Sep 29
- Leamington, UT 84638 · last May 2, first Oct 13
- Scipio, UT 84656 · last May 22, first Sep 25
- Hinckley, UT 84635 · last May 14, first Sep 30
- Holden, UT 84636 · last May 4, first Oct 14
- Levan, UT 84639 · last May 10, first Oct 7
- Fillmore, UT 84631 · last May 4, first Oct 14
Frequently asked questions
- When is the last frost in Oak City, UT?
- For ZIP code 84649, the average last spring frost (32°F) is May 2, based on NOAA 1991-2020 climate normals for the Oak City, UT weather station. There is a 1-in-10 chance of a frost after May 21.
- When is the first frost in Oak City, UT?
- The average first fall frost (32°F) is October 13. There is a 1-in-10 chance of frost by September 30, so tender plants are at risk from that point on.
- How long is the growing season in 84649?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 162 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.