Last spring frost
Apr 7
Frost Dates for Bagdad, AZ
First fall frost
Nov 12
Growing season
217 days
Hardiness zone
9a
In an average year around Bagdad, AZ, the last spring frost (32°F) is about Apr 7 and the first fall frost is about Nov 12, giving roughly a 217-day growing season. To be safe most years, wait until Mar 14 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 15 | Apr 26 | Apr 5 |
| Freeze (32°F) | May 3 | Apr 7 | Mar 14 |
| Hard (28°F) | Apr 8 | Mar 13 | Feb 19 |
| Severe (24°F) | Mar 15 | Feb 15 | Jan 12 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 15 | May 9 | May 4 | Apr 30 | Apr 26 | Apr 22 | Apr 18 | Apr 12 | Apr 5 |
| 32°F | May 3 | Apr 24 | Apr 18 | Apr 11 | Apr 7 | Apr 3 | Mar 31 | Mar 23 | Mar 14 |
| 28°F | Apr 8 | Apr 1 | Mar 26 | Mar 17 | Mar 13 | Mar 8 | Mar 4 | Feb 28 | Feb 19 |
| 24°F | Mar 15 | Mar 3 | Feb 28 | Feb 21 | Feb 15 | Feb 10 | Feb 4 | Jan 27 | Jan 12 |
| 20°F | Feb 20 | Feb 13 | Feb 6 | Jan 31 | Jan 22 | Jan 14 | Jan 6 | Dec 31 | Dec 17 |
| 16°F | Feb 16 | Feb 11 | Feb 3 | Jan 27 | Jan 18 | Jan 9 | Jan 3 | Dec 31 | Dec 19 |
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 17 | Nov 1 | Nov 14 |
| Freeze (32°F) | Oct 26 | Nov 12 | Nov 25 |
| Hard (28°F) | Nov 6 | Nov 22 | Dec 9 |
| Severe (24°F) | Nov 17 | Dec 6 | Dec 29 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 17 | Oct 22 | Oct 26 | Oct 30 | Nov 1 | Nov 4 | Nov 7 | Nov 10 | Nov 14 |
| 32°F | Oct 26 | Nov 1 | Nov 5 | Nov 9 | Nov 12 | Nov 14 | Nov 17 | Nov 21 | Nov 25 |
| 28°F | Nov 6 | Nov 12 | Nov 16 | Nov 18 | Nov 22 | Nov 25 | Nov 29 | Dec 3 | Dec 9 |
| 24°F | Nov 17 | Nov 24 | Nov 29 | Dec 2 | Dec 6 | Dec 11 | Dec 15 | Dec 20 | Dec 29 |
| 20°F | Dec 1 | Dec 7 | Dec 12 | Dec 18 | Dec 25 | Dec 31 | Jan 5 | Jan 16 | Feb 1 |
| 16°F | Dec 12 | Dec 24 | Dec 31 | Jan 3 | Jan 7 | Jan 17 | Jan 27 | Feb 5 | Feb 12 |
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: Bagdad, Az, about 5.7 miles away@if(!empty($station['elevation_ft'])), at 3,935 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 Bagdad, AZ?
On average, the last spring frost (32°F) around Bagdad, AZ is about Apr 7. In cooler years it can run later, so for a safer bet many gardeners wait until Mar 14.
When is the first frost in the fall?
The first fall frost around Bagdad, AZ typically arrives about Nov 12. 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 7 on average, or Mar 14 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 217 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 86321 Planting calendar → Arizona frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026