Frost Dates for Sierra Vista, AZ
In Sierra Vista, AZ, the average last spring frost is around Apr 5 and the average first fall frost around Nov 9, for a growing season of about 216 days. For frost-tender plants, wait until Apr 21, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Sierra Vista, AZ weather station, 3 miles away, elevation 4,606 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 21 | Oct 23 |
| 20% | Apr 15 | Oct 29 |
| 30% | Apr 11 | Nov 2 |
| 40% | Apr 8 | Nov 5 |
| 50% | Apr 5 | Nov 9 |
| 60% | Apr 2 | Nov 12 |
| 70% | Mar 30 | Nov 15 |
| 80% | Mar 24 | Nov 18 |
| 90% | Mar 15 | Nov 23 |
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 20 | Oct 30 |
| Frost / freeze (32°F) | Apr 5 | Nov 9 |
| Hard freeze (28°F) | Mar 15 | Nov 21 |
Planting calendar for Sierra Vista
Transplant Apr 12 – Apr 26
Transplant Apr 19 – May 3
Transplant Apr 19 – May 3
Transplant Apr 12 – Apr 26
Sow or transplant Apr 12 – Apr 26
Sow or transplant Apr 12 – Apr 26
Sow or transplant Apr 19 – May 3
Sow or transplant Mar 8 – Mar 22
Fall sowing Sep 14 – Oct 12
Fall sowing Sep 14 – Oct 5
Fall sowing Aug 31 – Sep 14
Sow or transplant Mar 8 – Mar 22
Fall sowing Aug 31 – Sep 28
Transplant Mar 22 – Apr 5
Fall sowing Aug 17 – Aug 31
Transplant Mar 15 – Mar 29
Fall sowing Aug 17 – Aug 31
Fall sowing Aug 17 – Aug 31
Fall sowing Sep 28 – Oct 19
Fall sowing Aug 31 – Sep 14
Plant Mar 8 – Mar 22
Based on the average last frost (Apr 5) and first frost (Nov 9). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.