Frost dates for Grand Canyon National Park Airport, AZ
At Grand Canyon National Park Airport, the median last spring frost (32°F) is Jun 17 and the median first fall frost is Sep 24, for a typical growing season of 97 days. For a 90% chance that the last frost has passed, wait until Jul 1. Nearby ZIP codes are in USDA hardiness zones 6a to 7b.
- Jun 17Last spring frost (median)50% chance of 32°F after this date
- Jul 1Safer planting date10% chance of 32°F after this date
- Sep 24First fall frost (median)50% chance of 32°F by this date
- 97 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 | Jun 15 | Jun 28 | Jul 12 |
| 32°F | Jun 3 | Jun 17 | Jul 1 |
| 28°F | May 14 | Jun 4 | Jun 21 |
| 24°F | Apr 30 | May 16 | Jun 8 |
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 3 | Sep 15 | Sep 25 |
| 32°F | Sep 12 | Sep 24 | Oct 6 |
| 28°F | Sep 21 | Oct 3 | Oct 17 |
| 24°F | Sep 29 | Oct 14 | Nov 1 |
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 | 58 days | 77 days | 95 days |
| 32°F | 80 days | 97 days | 116 days |
| 28°F | 100 days | 121 days | 144 days |
| 24°F | 124 days | 148 days | 172 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 |
|---|---|---|---|
| 86023 | 7a | 0 to 5°F | 17 km |
| 86052 | 6b | -5 to 0°F | 38 km |
| 86016 | 6b | -5 to 0°F | 51 km |
| 86046 | 7a | 0 to 5°F | 57 km |
| 86020 | 7b | 5 to 10°F | 59 km |
| 86435 | 7a | 0 to 5°F | 71 km |
| 86001 | 6a | -10 to -5°F | 74 km |
| 86320 | 7a | 0 to 5°F | 76 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 USW00003195, at 35.9461, -112.1547, elevation 2014 m (6,606 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 226.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Grand Canyon National Park 2 (12 km)
- Grand Canyon Visitor Center (13 km)
- Phantom Rch (19 km)
- Williams 35 NNW (27 km)
- Grand Canyon E Entrance (31 km)
- Bright Angel Ranger Station (31 km)
- Williams (78 km)
- Fort Valley (84 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.