Frost Dates for South Salt Lake, UT
In South Salt Lake, UT, the average last spring frost is around Mar 31 and the average first fall frost around Nov 8, for a growing season of about 224 days. For frost-tender plants, wait until Apr 19, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Salt Lake Triad Ctr, UT weather station, 4 miles away, elevation 4,280 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 19 | Oct 23 |
| 20% | Apr 12 | Oct 28 |
| 30% | Apr 7 | Nov 1 |
| 40% | Apr 3 | Nov 5 |
| 50% | Mar 31 | Nov 8 |
| 60% | Mar 26 | Nov 11 |
| 70% | Mar 19 | Nov 15 |
| 80% | Mar 13 | Nov 20 |
| 90% | Mar 7 | Nov 25 |
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 18 | Oct 28 |
| Frost / freeze (32°F) | Mar 31 | Nov 8 |
| Hard freeze (28°F) | Mar 8 | Nov 18 |
Planting calendar for South Salt Lake
Transplant Apr 7 – Apr 21
Transplant Apr 14 – Apr 28
Transplant Apr 14 – Apr 28
Transplant Apr 7 – Apr 21
Sow or transplant Apr 7 – Apr 21
Sow or transplant Apr 7 – Apr 21
Sow or transplant Apr 14 – Apr 28
Sow or transplant Mar 3 – Mar 17
Fall sowing Sep 13 – Oct 11
Fall sowing Sep 13 – Oct 4
Fall sowing Aug 30 – Sep 13
Sow or transplant Mar 3 – Mar 17
Fall sowing Aug 30 – Sep 27
Transplant Mar 17 – Mar 31
Fall sowing Aug 16 – Aug 30
Transplant Mar 10 – Mar 24
Fall sowing Aug 16 – Aug 30
Fall sowing Aug 16 – Aug 30
Fall sowing Sep 27 – Oct 18
Fall sowing Aug 30 – Sep 13
Plant Mar 3 – Mar 17
Based on the average last frost (Mar 31) and first frost (Nov 8). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.