Last spring frost
Apr 2
Frost Dates for Valle Vista, AZ
First fall frost
Nov 11
Growing season
220 days
Hardiness zone
8b
In an average year around Valle Vista, AZ, the last spring frost (32°F) is about Apr 2 and the first fall frost is about Nov 11, giving roughly a 220-day growing season. To be safe most years, wait until Mar 8 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) | May 9 | Apr 20 | Mar 30 |
| Freeze (32°F) | Apr 21 | Apr 2 | Mar 8 |
| Hard (28°F) | Apr 5 | Mar 6 | Feb 10 |
| Severe (24°F) | Mar 7 | Feb 10 | Jan 6 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 9 | May 1 | Apr 27 | Apr 24 | Apr 20 | Apr 16 | Apr 11 | Apr 7 | Mar 30 |
| 32°F | Apr 21 | Apr 15 | Apr 10 | Apr 6 | Apr 2 | Mar 28 | Mar 22 | Mar 16 | Mar 8 |
| 28°F | Apr 5 | Mar 28 | Mar 19 | Mar 12 | Mar 6 | Feb 28 | Feb 25 | Feb 19 | Feb 10 |
| 24°F | Mar 7 | Feb 27 | Feb 22 | Feb 16 | Feb 10 | Feb 5 | Jan 30 | Jan 19 | Jan 6 |
| 20°F | Feb 18 | Feb 7 | Feb 1 | Jan 25 | Jan 13 | Jan 5 | Dec 31 | Dec 24 | Dec 12 |
| 16°F | Feb 10 | Jan 28 | Jan 15 | Jan 8 | Jan 2 | Dec 30 | Dec 23 | Dec 15 | Dec 10 |
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 14 | Oct 31 | Nov 13 |
| Freeze (32°F) | Oct 26 | Nov 11 | Nov 24 |
| Hard (28°F) | Nov 6 | Nov 22 | Dec 7 |
| Severe (24°F) | Nov 15 | Dec 2 | Dec 23 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 14 | Oct 20 | Oct 24 | Oct 28 | Oct 31 | Nov 3 | Nov 6 | Nov 9 | Nov 13 |
| 32°F | Oct 26 | Nov 1 | Nov 5 | Nov 9 | Nov 11 | Nov 14 | Nov 17 | Nov 21 | Nov 24 |
| 28°F | Nov 6 | Nov 12 | Nov 15 | Nov 18 | Nov 22 | Nov 24 | Nov 28 | Dec 2 | Dec 7 |
| 24°F | Nov 15 | Nov 21 | Nov 25 | Nov 28 | Dec 2 | Dec 6 | Dec 11 | Dec 16 | Dec 23 |
| 20°F | Nov 24 | Nov 30 | Dec 6 | Dec 12 | Dec 17 | Dec 23 | Dec 28 | Jan 3 | Jan 23 |
| 16°F | Dec 3 | Dec 10 | Dec 16 | Dec 22 | Dec 28 | Jan 1 | Jan 6 | Jan 17 | Feb 1 |
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: Kingman Mohave Co Ap, Az, about 14.8 miles away@if(!empty($station['elevation_ft'])), at 3,420 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 Valle Vista, AZ?
On average, the last spring frost (32°F) around Valle Vista, AZ is about Apr 2. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 8.
When is the first frost in the fall?
The first fall frost around Valle Vista, AZ typically arrives about Nov 11. 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 Apr 2 on average, or Mar 8 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 220 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 86409 Planting calendar → Arizona frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026