Frost dates for 84655Santaquin, UT
The average last spring frost in Santaquin is May 4 and the average first fall frost is October 11, giving a typical growing season of about 157 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 4
- Average first fall frost
- Oct 11
- Growing season
- 157 days
Safer after May 28 (1-in-10 risk)
Possible by Sep 27 (1-in-10 risk)
Last frost typically in 189 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 3 · May 23 · Jun 8 | Sep 18 · Oct 1 · Oct 15 | 131 days | 100% |
| Frost / freeze (32°F) | Apr 18 · May 4 · May 28 | Sep 27 · Oct 11 · Oct 26 | 157 days | 100% |
| Hard freeze (28°F) | Mar 31 · Apr 19 · May 10 | Oct 8 · Oct 23 · Nov 7 | 185 days | 100% |
Planting calendar for Santaquin
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 3 – Jun 9 |
| Tomatoes | Transplant outdoors | May 20 – Jun 21 |
| Peppers | Start seeds indoors | Apr 3 – May 4 |
| Peppers | Transplant outdoors | Jun 3 – Jul 4 |
| Eggplant | Start seeds indoors | Apr 20 – May 19 |
| Eggplant | Transplant outdoors | Jun 3 – Jul 4 |
| Cucumbers | Sow outdoors | Jun 3 – Jul 1 |
| Summer squash | Sow outdoors | May 20 – Jul 4 |
| Winter squash & pumpkins | Sow outdoors | Jun 3 – Jul 4 |
| Snap beans | Sow outdoors | May 20 – Jul 24 |
| Sweet corn | Sow outdoors | May 20 – Jun 21 |
| Watermelon & cantaloupe | Sow outdoors | Jun 3 – Jul 4 |
| Okra | Sow outdoors | May 27 – Jun 19 |
| Peas | Sow outdoors (spring) | Apr 3 – May 19 |
| Potatoes | Plant outdoors (spring) | Apr 3 – Jun 3 |
| Onions | Start seeds indoors (spring) | Feb 20 – Mar 19 |
| Onions | Transplant outdoors (spring) | Apr 20 – May 19 |
| Broccoli | Start seeds indoors (spring) | Mar 16 – Apr 19 |
| Broccoli | Transplant outdoors (spring) | Apr 20 – May 19 |
| Broccoli | Start seeds indoors (fall) | Jun 11 – Jun 21 |
| Broccoli | Transplant outdoors (fall) | Jul 11 – Jul 22 |
| Cabbage | Start seeds indoors (spring) | Mar 6 – Apr 3 |
| Cabbage | Transplant outdoors (spring) | Apr 3 – May 4 |
| Cabbage | Start seeds indoors (fall) | Jun 1 – Jul 1 |
| Cabbage | Transplant outdoors (fall) | Jul 1 – Aug 1 |
| Leaf lettuce | Sow outdoors (spring) | Apr 3 – Jun 19 |
| Leaf lettuce | Sow outdoors (fall) | Jul 1 – Aug 17 |
| Spinach | Sow outdoors (spring) | Mar 27 – May 10 |
| Spinach | Sow outdoors (fall) | Jul 18 – Aug 22 |
| Radishes | Sow outdoors (spring) | Apr 3 – May 24 |
| Radishes | Sow outdoors (fall) | Jul 1 – Sep 1 |
| Kale | Sow outdoors (spring) | Apr 20 – May 10 |
| Kale | Sow outdoors (fall) | Jun 24 – Aug 1 |
| Carrots | Sow outdoors (spring) | May 4 – Jun 19 |
| Carrots | Sow outdoors (fall) | Jun 1 – Jul 17 |
| Garlic | Plant outdoors (fall) | Oct 1 – Nov 1 |
Where these dates come from
ZIP code 84655 is matched to the NOAA station Santaquin Chlorinator, UT, 2.7 km away, at 5,160 ft elevation (232 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Santaquin Chlorinator, UT (used) | 5,160 ft | May 4 | Oct 11 |
| Spanish Fk Pwr House, UT | 4,720 ft | Apr 25 | Oct 18 |
| Nephi, UT | 5,146 ft | May 6 | Oct 10 |
| Provo Byu, UT | 4,570 ft | Apr 18 | Oct 21 |
Frost dates near Santaquin
- Goshen, UT 84633 · last Apr 25, first Oct 18
- Payson, UT 84651 · last Apr 25, first Oct 18
- Elberta, UT 84626 · last Apr 25, first Oct 18
- Mona, UT 84645 · last May 6, first Oct 10
- Salem, UT 84653 · last May 17, first Oct 5
- Spanish Fork, UT 84660 · last Apr 25, first Oct 18
- Mapleton, UT 84664 · last Apr 25, first Oct 18
- Eureka, UT 84628 · last Jun 1, first Sep 20
Frequently asked questions
- When is the last frost in Santaquin, UT?
- For ZIP code 84655, the average last spring frost (32°F) is May 4, based on NOAA 1991-2020 climate normals for the Santaquin Chlorinator, UT weather station. There is a 1-in-10 chance of a frost after May 28.
- When is the first frost in Santaquin, UT?
- The average first fall frost (32°F) is October 11. There is a 1-in-10 chance of frost by September 27, so tender plants are at risk from that point on.
- How long is the growing season in 84655?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 157 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.