Last spring frost
May 16
Frost Dates for Seven Mile, AZ
First fall frost
Oct 13
Growing season
149 days
Hardiness zone
7b
In an average year around Seven Mile, AZ, the last spring frost (32°F) is about May 16 and the first fall frost is about Oct 13, giving roughly a 149-day growing season. To be safe most years, wait until May 2 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Jun 10 | May 29 | May 14 |
| Freeze (32°F) | Jun 2 | May 16 | May 2 |
| Hard (28°F) | May 20 | May 4 | Apr 20 |
| Severe (24°F) | May 7 | Apr 20 | Apr 4 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 10 | Jun 6 | Jun 3 | May 31 | May 29 | May 25 | May 22 | May 19 | May 14 |
| 32°F | Jun 2 | May 28 | May 23 | May 19 | May 16 | May 13 | May 11 | May 7 | May 2 |
| 28°F | May 20 | May 14 | May 11 | May 8 | May 4 | May 2 | Apr 29 | Apr 25 | Apr 20 |
| 24°F | May 7 | May 1 | Apr 27 | Apr 24 | Apr 20 | Apr 17 | Apr 14 | Apr 9 | Apr 4 |
| 20°F | Apr 22 | Apr 15 | Apr 10 | Apr 6 | Apr 3 | Mar 28 | Mar 21 | Mar 13 | Mar 4 |
| 16°F | Apr 6 | Mar 29 | Mar 19 | Mar 12 | Mar 7 | Mar 2 | Feb 25 | Feb 19 | Feb 11 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Sep 23 | Oct 4 | Oct 18 |
| Freeze (32°F) | Sep 30 | Oct 13 | Oct 27 |
| Hard (28°F) | Oct 8 | Oct 23 | Nov 6 |
| Severe (24°F) | Oct 16 | Nov 3 | Nov 18 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 23 | Sep 27 | Sep 30 | Oct 2 | Oct 4 | Oct 7 | Oct 10 | Oct 13 | Oct 18 |
| 32°F | Sep 30 | Oct 4 | Oct 7 | Oct 10 | Oct 13 | Oct 16 | Oct 19 | Oct 22 | Oct 27 |
| 28°F | Oct 8 | Oct 13 | Oct 17 | Oct 20 | Oct 23 | Oct 26 | Oct 29 | Nov 2 | Nov 6 |
| 24°F | Oct 16 | Oct 22 | Oct 28 | Oct 31 | Nov 3 | Nov 6 | Nov 10 | Nov 14 | Nov 18 |
| 20°F | Oct 27 | Nov 1 | Nov 6 | Nov 10 | Nov 13 | Nov 16 | Nov 20 | Nov 24 | Nov 30 |
| 16°F | Nov 4 | Nov 12 | Nov 16 | Nov 19 | Nov 23 | Nov 27 | Dec 1 | Dec 6 | Dec 11 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Black Rvr Pumps, Az, about 24 miles away@if(!empty($station['elevation_ft'])), at 6,065 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Seven Mile, AZ?
On average, the last spring frost (32°F) around Seven Mile, AZ is about May 16. In cooler years it can run later, so for a safer bet many gardeners wait until May 2.
When is the first frost in the fall?
The first fall frost around Seven Mile, AZ typically arrives about Oct 13. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around May 16 on average, or May 2 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 149 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 85926 Planting calendar → Arizona frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026