Frost Dates for Cottonwood Heights, UT
In Cottonwood Heights, UT, the average last spring frost is around Apr 29 and the average first fall frost around Oct 22, for a growing season of about 174 days. For frost-tender plants, wait until May 30, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Cottonwood Weir, UT weather station, 2 miles away, elevation 4,986 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 30 | Oct 6 |
| 20% | May 15 | Oct 12 |
| 30% | May 8 | Oct 16 |
| 40% | May 2 | Oct 19 |
| 50% | Apr 29 | Oct 22 |
| 60% | Apr 25 | Oct 26 |
| 70% | Apr 21 | Oct 29 |
| 80% | Apr 17 | Nov 2 |
| 90% | Apr 10 | Nov 7 |
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 13 | Oct 11 |
| Frost / freeze (32°F) | Apr 29 | Oct 22 |
| Hard freeze (28°F) | Apr 12 | Nov 1 |
Planting calendar for Cottonwood Heights
Transplant May 6 – May 20
Transplant May 13 – May 27
Transplant May 13 – May 27
Transplant May 6 – May 20
Sow or transplant May 6 – May 20
Sow or transplant May 6 – May 20
Sow or transplant May 13 – May 27
Sow or transplant Apr 1 – Apr 15
Fall sowing Aug 27 – Sep 24
Fall sowing Aug 27 – Sep 17
Fall sowing Aug 13 – Aug 27
Sow or transplant Apr 1 – Apr 15
Fall sowing Aug 13 – Sep 10
Transplant Apr 15 – Apr 29
Fall sowing Jul 30 – Aug 13
Transplant Apr 8 – Apr 22
Fall sowing Jul 30 – Aug 13
Fall sowing Jul 30 – Aug 13
Fall sowing Sep 10 – Oct 1
Fall sowing Aug 13 – Aug 27
Plant Apr 1 – Apr 15
Based on the average last frost (Apr 29) and first frost (Oct 22). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.