Frost Dates for American Fork, UT
In American Fork, UT, the average last spring frost is around Apr 17 and the average first fall frost around Oct 25, for a growing season of about 188 days. For frost-tender plants, wait until May 7, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Pleasant Grove, UT weather station, 3 miles away, elevation 4,692 ft. Frost can come earlier in low spots and valleys and later near cities and large lakes.
Frost probability by date
Chance of a 32°F frost after the spring date, or before the fall date.
| Chance | Last spring frost | First fall frost |
|---|---|---|
| 10% | May 7 | Oct 10 |
| 20% | Apr 30 | Oct 16 |
| 30% | Apr 26 | Oct 19 |
| 40% | Apr 22 | Oct 22 |
| 50% | Apr 17 | Oct 25 |
| 60% | Apr 13 | Oct 28 |
| 70% | Apr 9 | Oct 31 |
| 80% | Apr 5 | Nov 4 |
| 90% | Mar 30 | Nov 8 |
Light frost vs. hard freeze
Average (50%) dates for each temperature. Tender plants are damaged at 36°F; most hardy crops survive until 28°F.
| Temperature | Last in spring | First in fall |
|---|---|---|
| Light frost (36°F) | May 3 | Oct 13 |
| Frost / freeze (32°F) | Apr 17 | Oct 25 |
| Hard freeze (28°F) | Mar 30 | Nov 5 |
Planting calendar for American Fork
Transplant Apr 24 – May 8
Transplant May 1 – May 15
Transplant May 1 – May 15
Transplant Apr 24 – May 8
Sow or transplant Apr 24 – May 8
Sow or transplant Apr 24 – May 8
Sow or transplant May 1 – May 15
Sow or transplant Mar 20 – Apr 3
Fall sowing Aug 30 – Sep 27
Fall sowing Aug 30 – Sep 20
Fall sowing Aug 16 – Aug 30
Sow or transplant Mar 20 – Apr 3
Fall sowing Aug 16 – Sep 13
Transplant Apr 3 – Apr 17
Fall sowing Aug 2 – Aug 16
Transplant Mar 27 – Apr 10
Fall sowing Aug 2 – Aug 16
Fall sowing Aug 2 – Aug 16
Fall sowing Sep 13 – Oct 4
Fall sowing Aug 16 – Aug 30
Plant Mar 20 – Apr 3
Based on the average last frost (Apr 17) and first frost (Oct 25). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.