Frost Dates for West Valley City, UT
In West Valley City, UT, the average last spring frost is around Apr 8 and the average first fall frost around Oct 31, for a growing season of about 204 days. For frost-tender plants, wait until Apr 30, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Salt Lake City Intl. Airport, UT weather station, 7 miles away, elevation 4,225 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% | Apr 30 | Oct 17 |
| 20% | Apr 21 | Oct 22 |
| 30% | Apr 16 | Oct 25 |
| 40% | Apr 11 | Oct 28 |
| 50% | Apr 8 | Oct 31 |
| 60% | Apr 4 | Nov 2 |
| 70% | Mar 31 | Nov 5 |
| 80% | Mar 27 | Nov 9 |
| 90% | Mar 17 | Nov 13 |
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) | Apr 27 | Oct 19 |
| Frost / freeze (32°F) | Apr 8 | Oct 31 |
| Hard freeze (28°F) | Mar 15 | Nov 10 |
Planting calendar for West Valley City
Transplant Apr 15 – Apr 29
Transplant Apr 22 – May 6
Transplant Apr 22 – May 6
Transplant Apr 15 – Apr 29
Sow or transplant Apr 15 – Apr 29
Sow or transplant Apr 15 – Apr 29
Sow or transplant Apr 22 – May 6
Sow or transplant Mar 11 – Mar 25
Fall sowing Sep 5 – Oct 3
Fall sowing Sep 5 – Sep 26
Fall sowing Aug 22 – Sep 5
Sow or transplant Mar 11 – Mar 25
Fall sowing Aug 22 – Sep 19
Transplant Mar 25 – Apr 8
Fall sowing Aug 8 – Aug 22
Transplant Mar 18 – Apr 1
Fall sowing Aug 8 – Aug 22
Fall sowing Aug 8 – Aug 22
Fall sowing Sep 19 – Oct 10
Fall sowing Aug 22 – Sep 5
Plant Mar 11 – Mar 25
Based on the average last frost (Apr 8) and first frost (Oct 31). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.