Last spring frost
May 1
Frost Dates for Kaibab, AZ
First fall frost
Oct 19
Growing season
168 days
Hardiness zone
7a
In an average year around Kaibab, AZ, the last spring frost (32°F) is about May 1 and the first fall frost is about Oct 19, giving roughly a 168-day growing season. To be safe most years, wait until Apr 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) | May 31 | May 14 | Apr 29 |
| Freeze (32°F) | May 18 | May 1 | Apr 17 |
| Hard (28°F) | May 5 | Apr 18 | Mar 31 |
| Severe (24°F) | Apr 22 | Mar 31 | Mar 6 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 31 | May 26 | May 20 | May 17 | May 14 | May 10 | May 7 | May 3 | Apr 29 |
| 32°F | May 18 | May 13 | May 8 | May 4 | May 1 | Apr 28 | Apr 25 | Apr 22 | Apr 17 |
| 28°F | May 5 | Apr 30 | Apr 25 | Apr 22 | Apr 18 | Apr 14 | Apr 11 | Apr 6 | Mar 31 |
| 24°F | Apr 22 | Apr 14 | Apr 9 | Apr 4 | Mar 31 | Mar 26 | Mar 19 | Mar 13 | Mar 6 |
| 20°F | Mar 31 | Mar 20 | Mar 13 | Mar 8 | Mar 5 | Mar 1 | Feb 26 | Feb 21 | Feb 13 |
| 16°F | Mar 9 | Mar 3 | Feb 28 | Feb 22 | Feb 18 | Feb 12 | Feb 5 | Jan 31 | Jan 21 |
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) | Sep 28 | Oct 9 | Oct 22 |
| Freeze (32°F) | Oct 5 | Oct 19 | Nov 1 |
| Hard (28°F) | Oct 14 | Oct 29 | Nov 11 |
| Severe (24°F) | Oct 22 | Nov 7 | Nov 22 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 28 | Oct 2 | Oct 4 | Oct 7 | Oct 9 | Oct 12 | Oct 14 | Oct 17 | Oct 22 |
| 32°F | Oct 5 | Oct 9 | Oct 13 | Oct 16 | Oct 19 | Oct 22 | Oct 24 | Oct 27 | Nov 1 |
| 28°F | Oct 14 | Oct 19 | Oct 23 | Oct 26 | Oct 29 | Nov 1 | Nov 3 | Nov 6 | Nov 11 |
| 24°F | Oct 22 | Oct 29 | Nov 1 | Nov 4 | Nov 7 | Nov 11 | Nov 14 | Nov 18 | Nov 22 |
| 20°F | Nov 1 | Nov 7 | Nov 13 | Nov 16 | Nov 19 | Nov 21 | Nov 24 | Nov 29 | Dec 5 |
| 16°F | Nov 13 | Nov 18 | Nov 21 | Nov 25 | Nov 29 | Dec 2 | Dec 6 | Dec 10 | Dec 16 |
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: Pipe Spring Nm, Az, about 11.8 miles away@if(!empty($station['elevation_ft'])), at 4,920 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 Kaibab, AZ?
On average, the last spring frost (32°F) around Kaibab, AZ is about May 1. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 17.
When is the first frost in the fall?
The first fall frost around Kaibab, AZ typically arrives about Oct 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 May 1 on average, or Apr 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 168 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 86022 Planting calendar → Arizona frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026