Last spring frost
Jun 11
Frost Dates for Fort Valley, AZ
First fall frost
Sep 25
Growing season
99 days
Hardiness zone
6a
In an average year around Fort Valley, AZ, the last spring frost (32°F) is about Jun 11 and the first fall frost is about Sep 25, giving roughly a 99-day growing season. To be safe most years, wait until May 26 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%) |
|---|---|---|---|
| Freeze (32°F) | Jun 30 | Jun 11 | May 26 |
| Hard (28°F) | Jun 14 | May 27 | May 6 |
| Severe (24°F) | May 27 | May 5 | Apr 19 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 32°F | Jun 30 | Jun 24 | Jun 19 | Jun 14 | Jun 11 | Jun 7 | Jun 5 | May 31 | May 26 |
| 28°F | Jun 14 | Jun 7 | Jun 3 | May 31 | May 27 | May 22 | May 18 | May 13 | May 6 |
| 24°F | May 27 | May 18 | May 13 | May 9 | May 5 | May 2 | Apr 29 | Apr 24 | Apr 19 |
| 20°F | May 6 | Apr 30 | Apr 26 | Apr 22 | Apr 19 | Apr 15 | Apr 11 | Apr 7 | Apr 1 |
| 16°F | Apr 18 | Apr 11 | Apr 7 | Apr 4 | Mar 30 | Mar 22 | Mar 17 | Mar 12 | Mar 6 |
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%) |
|---|---|---|---|
| Freeze (32°F) | Sep 8 | Sep 25 | Oct 6 |
| Hard (28°F) | Sep 21 | Oct 4 | Oct 19 |
| Severe (24°F) | Sep 30 | Oct 14 | Nov 1 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 32°F | Sep 8 | Sep 16 | Sep 19 | Sep 22 | Sep 25 | Sep 27 | Sep 30 | Oct 2 | Oct 6 |
| 28°F | Sep 21 | Sep 26 | Sep 30 | Oct 2 | Oct 4 | Oct 6 | Oct 10 | Oct 13 | Oct 19 |
| 24°F | Sep 30 | Oct 4 | Oct 7 | Oct 11 | Oct 14 | Oct 18 | Oct 21 | Oct 26 | Nov 1 |
| 20°F | Oct 10 | Oct 16 | Oct 20 | Oct 24 | Oct 28 | Nov 1 | Nov 4 | Nov 9 | Nov 14 |
| 16°F | Oct 21 | Oct 28 | Nov 1 | Nov 5 | Nov 9 | Nov 13 | Nov 17 | Nov 20 | Nov 25 |
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: Ft Valley, Az, about 6.4 miles away@if(!empty($station['elevation_ft'])), at 7,347 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 Fort Valley, AZ?
On average, the last spring frost (32°F) around Fort Valley, AZ is about Jun 11. In cooler years it can run later, so for a safer bet many gardeners wait until May 26.
When is the first frost in the fall?
The first fall frost around Fort Valley, AZ typically arrives about Sep 25. 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 Jun 11 on average, or May 26 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 99 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 86001 Planting calendar → Arizona frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026