Frost Dates for Apache Junction, AZ
In Apache Junction, AZ, the average last spring frost is around Feb 11 and the average first fall frost around Dec 10, for a growing season of about 304 days. For frost-tender plants, wait until Mar 7, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Apache Junction 5 Ne, AZ weather station, 6 miles away, elevation 2,070 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% | Mar 7 | Nov 19 |
| 20% | Feb 28 | Nov 26 |
| 30% | Feb 21 | Dec 1 |
| 40% | Feb 16 | Dec 6 |
| 50% | Feb 11 | Dec 10 |
| 60% | Feb 5 | Dec 14 |
| 70% | Jan 27 | Dec 19 |
| 80% | Jan 18 | Dec 25 |
| 90% | Jan 5 | Jan 1 |
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) | Mar 6 | Nov 28 |
| Frost / freeze (32°F) | Feb 11 | Dec 10 |
| Hard freeze (28°F) | Jan 13 | Dec 22 |
Planting calendar for Apache Junction
Transplant Feb 18 – Mar 4
Transplant Feb 25 – Mar 11
Transplant Feb 25 – Mar 11
Transplant Feb 18 – Mar 4
Sow or transplant Feb 18 – Mar 4
Sow or transplant Feb 18 – Mar 4
Sow or transplant Feb 25 – Mar 11
Sow or transplant Jan 14 – Jan 28
Fall sowing Oct 15 – Nov 12
Fall sowing Oct 15 – Nov 5
Fall sowing Oct 1 – Oct 15
Sow or transplant Jan 14 – Jan 28
Fall sowing Oct 1 – Oct 29
Transplant Jan 28 – Feb 11
Fall sowing Sep 17 – Oct 1
Transplant Jan 21 – Feb 4
Fall sowing Sep 17 – Oct 1
Fall sowing Sep 17 – Oct 1
Fall sowing Oct 29 – Nov 19
Fall sowing Oct 1 – Oct 15
Plant Jan 14 – Jan 28
Based on the average last frost (Feb 11) and first frost (Dec 10). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.