Last spring frost
Apr 14
Frost Dates for Sunizona, AZ
First fall frost
Nov 2
Growing season
200 days
Hardiness zone
8a
In an average year around Sunizona, AZ, the last spring frost (32°F) is about Apr 14 and the first fall frost is about Nov 2, giving roughly a 200-day growing season. To be safe most years, wait until Mar 28 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 10 | Apr 28 | Apr 13 |
| Freeze (32°F) | Apr 30 | Apr 14 | Mar 28 |
| Hard (28°F) | Apr 16 | Mar 27 | Mar 4 |
| Severe (24°F) | Mar 29 | Mar 4 | Feb 7 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 10 | May 6 | May 3 | May 1 | Apr 28 | Apr 25 | Apr 22 | Apr 18 | Apr 13 |
| 32°F | Apr 30 | Apr 24 | Apr 21 | Apr 17 | Apr 14 | Apr 10 | Apr 7 | Apr 4 | Mar 28 |
| 28°F | Apr 16 | Apr 9 | Apr 5 | Apr 1 | Mar 27 | Mar 22 | Mar 17 | Mar 11 | Mar 4 |
| 24°F | Mar 29 | Mar 18 | Mar 13 | Mar 9 | Mar 4 | Feb 28 | Feb 24 | Feb 17 | Feb 7 |
| 20°F | Mar 4 | Feb 25 | Feb 18 | Feb 13 | Feb 7 | Feb 2 | Jan 27 | Jan 18 | Jan 5 |
| 16°F | Feb 13 | Feb 4 | Jan 31 | Jan 24 | Jan 16 | Jan 10 | Jan 2 | Dec 25 | Dec 12 |
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 12 | Oct 24 | Nov 5 |
| Freeze (32°F) | Oct 20 | Nov 2 | Nov 16 |
| Hard (28°F) | Oct 30 | Nov 13 | Nov 29 |
| Severe (24°F) | Nov 9 | Nov 26 | Dec 13 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 12 | Oct 17 | Oct 19 | Oct 21 | Oct 24 | Oct 26 | Oct 29 | Nov 1 | Nov 5 |
| 32°F | Oct 20 | Oct 24 | Oct 28 | Oct 31 | Nov 2 | Nov 5 | Nov 8 | Nov 12 | Nov 16 |
| 28°F | Oct 30 | Nov 3 | Nov 6 | Nov 10 | Nov 13 | Nov 16 | Nov 19 | Nov 23 | Nov 29 |
| 24°F | Nov 9 | Nov 14 | Nov 18 | Nov 23 | Nov 26 | Nov 30 | Dec 3 | Dec 6 | Dec 13 |
| 20°F | Nov 20 | Nov 26 | Nov 30 | Dec 4 | Dec 7 | Dec 11 | Dec 16 | Dec 24 | Jan 3 |
| 16°F | Dec 1 | Dec 6 | Dec 11 | Dec 18 | Dec 24 | Dec 31 | Jan 7 | Jan 18 | 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: Pearce - Sunsites, Az, about 11 miles away@if(!empty($station['elevation_ft'])), at 4,350 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 Sunizona, AZ?
On average, the last spring frost (32°F) around Sunizona, AZ is about Apr 14. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 28.
When is the first frost in the fall?
The first fall frost around Sunizona, AZ typically arrives about Nov 2. 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 14 on average, or Mar 28 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 200 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 85625 Planting calendar → Arizona frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026