Last spring frost
Mar 13
Frost Dates for Dudleyville, AZ
First fall frost
Nov 19
Growing season
247 days
Hardiness zone
9a
In an average year around Dudleyville, AZ, the last spring frost (32°F) is about Mar 13 and the first fall frost is about Nov 19, giving roughly a 247-day growing season. To be safe most years, wait until Feb 17 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) | Apr 21 | Apr 1 | Mar 11 |
| Freeze (32°F) | Apr 6 | Mar 13 | Feb 17 |
| Hard (28°F) | Mar 13 | Feb 17 | Jan 21 |
| Severe (24°F) | Feb 25 | Jan 25 | Dec 24 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 21 | Apr 14 | Apr 9 | Apr 5 | Apr 1 | Mar 29 | Mar 25 | Mar 19 | Mar 11 |
| 32°F | Apr 6 | Mar 30 | Mar 24 | Mar 19 | Mar 13 | Mar 8 | Mar 3 | Feb 26 | Feb 17 |
| 28°F | Mar 13 | Mar 5 | Feb 28 | Feb 24 | Feb 17 | Feb 11 | Feb 5 | Jan 30 | Jan 21 |
| 24°F | Feb 25 | Feb 15 | Feb 6 | Jan 31 | Jan 25 | Jan 19 | Jan 11 | Jan 3 | Dec 24 |
| 20°F | Feb 16 | Feb 3 | Jan 26 | Jan 17 | Jan 9 | Jan 3 | Dec 29 | Dec 20 | Dec 12 |
| 16°F | Feb 6 | Jan 31 | Jan 28 | Jan 23 | Jan 18 | Jan 14 | Jan 8 | Jan 2 | Dec 30 |
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) | Oct 24 | Nov 9 | Nov 23 |
| Freeze (32°F) | Nov 3 | Nov 19 | Dec 4 |
| Hard (28°F) | Nov 14 | Dec 1 | Dec 18 |
| Severe (24°F) | Nov 25 | Dec 13 | Jan 14 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 24 | Oct 31 | Nov 3 | Nov 6 | Nov 9 | Nov 12 | Nov 15 | Nov 18 | Nov 23 |
| 32°F | Nov 3 | Nov 9 | Nov 13 | Nov 17 | Nov 19 | Nov 22 | Nov 26 | Nov 30 | Dec 4 |
| 28°F | Nov 14 | Nov 20 | Nov 25 | Nov 29 | Dec 1 | Dec 4 | Dec 8 | Dec 12 | Dec 18 |
| 24°F | Nov 25 | Dec 1 | Dec 5 | Dec 9 | Dec 13 | Dec 18 | Dec 23 | Jan 1 | Jan 14 |
| 20°F | Dec 5 | Dec 12 | Dec 19 | Dec 24 | Dec 31 | Jan 5 | Jan 13 | Jan 24 | Feb 4 |
| 16°F | Dec 30 | Jan 1 | Jan 5 | Jan 10 | Jan 16 | Jan 22 | Jan 26 | Jan 30 | Feb 2 |
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: San Carlos Reservoir, Az, about 17.5 miles away@if(!empty($station['elevation_ft'])), at 2,532 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 Dudleyville, AZ?
On average, the last spring frost (32°F) around Dudleyville, AZ is about Mar 13. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 17.
When is the first frost in the fall?
The first fall frost around Dudleyville, AZ typically arrives about Nov 19. 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 Mar 13 on average, or Feb 17 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 247 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 85192 Planting calendar → Arizona frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026