Frost dates for Happy Jack Ranger Station, AZ
At Happy Jack Ranger Station, the median last spring frost (32°F) is Jun 1 and the median first fall frost is Oct 3, for a typical growing season of 124 days. For a 90% chance that the last frost has passed, wait until Jun 13. Nearby ZIP codes are in USDA hardiness zones 6a to 8b.
- Jun 1Last spring frost (median)50% chance of 32°F after this date
- Jun 13Safer planting date10% chance of 32°F after this date
- Oct 3First fall frost (median)50% chance of 32°F by this date
- 124 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | May 31 | Jun 11 | Jun 25 |
| 32°F | May 14 | Jun 1 | Jun 13 |
| 28°F | Apr 28 | May 17 | Jun 3 |
| 24°F | Apr 12 | Apr 30 | May 21 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Sep 11 | Sep 23 | Oct 4 |
| 32°F | Sep 22 | Oct 3 | Oct 16 |
| 28°F | Oct 1 | Oct 14 | Oct 30 |
| 24°F | Oct 12 | Oct 28 | Nov 11 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 83 days | 102 days | 120 days |
| 32°F | 105 days | 124 days | 146 days |
| 28°F | 128 days | 149 days | 174 days |
| 24°F | 153 days | 179 days | 203 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 86038 | 6b | -5 to 0°F | 20 km |
| 86024 | 7a | 0 to 5°F | 22 km |
| 86335 | 8a | 10 to 15°F | 25 km |
| 86017 | 7a | 0 to 5°F | 33 km |
| 86351 | 8b | 15 to 20°F | 34 km |
| 85544 | 8a | 10 to 15°F | 40 km |
| 86005 | 6a | -10 to -5°F | 43 km |
| 86336 | 8b | 15 to 20°F | 43 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00023828, at 34.7433, -111.4139, elevation 2280 m (7,480 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 198.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Blue Ridge Ranger Station (25 km)
- Mund's Park (30 km)
- Sedona (36 km)
- Oak Creek Canyon (39 km)
- Montezuma Castle National Monument (42 km)
- Natural Brg (47 km)
- Meteor Crater (48 km)
- Walnut Canyon National Monument (48 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.