Frost Dates for El Mirage, AZ
In El Mirage, AZ, the average last spring frost is around Jan 20 and the average first fall frost around Dec 15, for a growing season of about 331 days. For frost-tender plants, wait until Feb 18, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Youngtown, AZ weather station, 1 mile away, elevation 1,135 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% | Feb 18 | Nov 28 |
| 20% | Feb 9 | Dec 3 |
| 30% | Feb 2 | Dec 8 |
| 40% | Jan 28 | Dec 11 |
| 50% | Jan 20 | Dec 15 |
| 60% | Jan 13 | Dec 19 |
| 70% | Jan 6 | Dec 23 |
| 80% | Dec 31 | Dec 28 |
| 90% | Dec 23 | Jan 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) | Feb 14 | Dec 2 |
| Frost / freeze (32°F) | Jan 20 | Dec 15 |
| Hard freeze (28°F) | Jan 3 | Dec 29 |
Planting calendar for El Mirage
Transplant Jan 27 – Feb 10
Transplant Feb 3 – Feb 17
Transplant Feb 3 – Feb 17
Transplant Jan 27 – Feb 10
Sow or transplant Jan 27 – Feb 10
Sow or transplant Jan 27 – Feb 10
Sow or transplant Feb 3 – Feb 17
Sow or transplant Dec 23 – Jan 6
Fall sowing Oct 20 – Nov 17
Fall sowing Oct 20 – Nov 10
Fall sowing Oct 6 – Oct 20
Sow or transplant Dec 23 – Jan 6
Fall sowing Oct 6 – Nov 3
Transplant Jan 6 – Jan 20
Fall sowing Sep 22 – Oct 6
Transplant Dec 30 – Jan 13
Fall sowing Sep 22 – Oct 6
Fall sowing Sep 22 – Oct 6
Fall sowing Nov 3 – Nov 24
Fall sowing Oct 6 – Oct 20
Plant Dec 23 – Jan 6
Based on the average last frost (Jan 20) and first frost (Dec 15). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.