Frost Dates for Marana, AZ
In Marana, AZ, the average last spring frost is around Apr 2 and the average first fall frost around Nov 11, for a growing season of about 222 days. For frost-tender plants, wait until Apr 18, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Catalina Sp, AZ weather station, 12 miles away, elevation 2,707 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 18 | Oct 26 |
| 20% | Apr 12 | Oct 31 |
| 30% | Apr 8 | Nov 4 |
| 40% | Apr 5 | Nov 7 |
| 50% | Apr 2 | Nov 11 |
| 60% | Mar 31 | Nov 15 |
| 70% | Mar 26 | Nov 18 |
| 80% | Mar 21 | Nov 23 |
| 90% | Mar 16 | Nov 29 |
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 | Nov 1 |
| Frost / freeze (32°F) | Apr 2 | Nov 11 |
| Hard freeze (28°F) | Mar 12 | Nov 21 |
Planting calendar for Marana
Transplant Apr 9 – Apr 23
Transplant Apr 16 – Apr 30
Transplant Apr 16 – Apr 30
Transplant Apr 9 – Apr 23
Sow or transplant Apr 9 – Apr 23
Sow or transplant Apr 9 – Apr 23
Sow or transplant Apr 16 – Apr 30
Sow or transplant Mar 5 – Mar 19
Fall sowing Sep 16 – Oct 14
Fall sowing Sep 16 – Oct 7
Fall sowing Sep 2 – Sep 16
Sow or transplant Mar 5 – Mar 19
Fall sowing Sep 2 – Sep 30
Transplant Mar 19 – Apr 2
Fall sowing Aug 19 – Sep 2
Transplant Mar 12 – Mar 26
Fall sowing Aug 19 – Sep 2
Fall sowing Aug 19 – Sep 2
Fall sowing Sep 30 – Oct 21
Fall sowing Sep 2 – Sep 16
Plant Mar 5 – Mar 19
Based on the average last frost (Apr 2) and first frost (Nov 11). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.