Last spring frost
Mar 17
Frost Dates for Wenden, AZ
First fall frost
Nov 19
Growing season
243 days
Hardiness zone
9a
In an average year around Wenden, AZ, the last spring frost (32°F) is about Mar 17 and the first fall frost is about Nov 19, giving roughly a 243-day growing season. To be safe most years, wait until Feb 18 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 27 | Apr 7 | Mar 17 |
| Freeze (32°F) | Apr 12 | Mar 17 | Feb 18 |
| Hard (28°F) | Mar 24 | Feb 19 | Jan 9 |
| Severe (24°F) | Feb 27 | Jan 23 | Dec 17 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 27 | Apr 21 | Apr 15 | Apr 11 | Apr 7 | Apr 2 | Mar 30 | Mar 25 | Mar 17 |
| 32°F | Apr 12 | Apr 5 | Mar 31 | Mar 23 | Mar 17 | Mar 11 | Mar 5 | Feb 27 | Feb 18 |
| 28°F | Mar 24 | Mar 11 | Mar 2 | Feb 25 | Feb 19 | Feb 12 | Feb 4 | Jan 26 | Jan 9 |
| 24°F | Feb 27 | Feb 17 | Feb 7 | Jan 31 | Jan 23 | Jan 14 | Jan 6 | Dec 28 | Dec 17 |
| 20°F | Feb 10 | Feb 2 | Jan 27 | Jan 17 | Jan 12 | Jan 7 | Jan 3 | Dec 28 | Dec 15 |
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 25 | Nov 9 | Nov 22 |
| Freeze (32°F) | Nov 5 | Nov 19 | Dec 1 |
| Hard (28°F) | Nov 17 | Dec 1 | Dec 19 |
| Severe (24°F) | Nov 28 | Dec 21 | Jan 25 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 25 | Nov 1 | Nov 4 | Nov 7 | Nov 9 | Nov 11 | Nov 14 | Nov 17 | Nov 22 |
| 32°F | Nov 5 | Nov 10 | Nov 14 | Nov 16 | Nov 19 | Nov 21 | Nov 24 | Nov 27 | Dec 1 |
| 28°F | Nov 17 | Nov 21 | Nov 25 | Nov 27 | Dec 1 | Dec 4 | Dec 8 | Dec 13 | Dec 19 |
| 24°F | Nov 28 | Dec 4 | Dec 9 | Dec 15 | Dec 21 | Dec 26 | Jan 1 | Jan 8 | Jan 25 |
| 20°F | Dec 13 | Dec 23 | Jan 1 | Jan 4 | Jan 7 | Jan 13 | Jan 18 | Jan 27 | Feb 6 |
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: Aguila, Az, about 16 miles away@if(!empty($station['elevation_ft'])), at 2,165 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 Wenden, AZ?
On average, the last spring frost (32°F) around Wenden, AZ is about Mar 17. In cooler years it can run later, so for a safer bet many gardeners wait until Feb 18.
When is the first frost in the fall?
The first fall frost around Wenden, 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 17 on average, or Feb 18 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 243 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 85357 Planting calendar → Arizona frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026