Frost dates for Grand Canyon E Entrance, AZ
At Grand Canyon E Entrance, the median last spring frost (32°F) is May 10 and the median first fall frost is Oct 20, for a typical growing season of 165 days. For a 90% chance that the last frost has passed, wait until May 24. Nearby ZIP codes are in USDA hardiness zones 6a to 7b.
- May 10Last spring frost (median)50% chance of 32°F after this date
- May 24Safer planting date10% chance of 32°F after this date
- Oct 20First fall frost (median)50% chance of 32°F by this date
- 165 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 5 | May 20 | Jun 1 |
| 32°F | Apr 23 | May 10 | May 24 |
| 28°F | Apr 4 | Apr 26 | May 14 |
| 24°F | Mar 16 | Apr 6 | Apr 30 |
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 28 | Oct 10 | Oct 23 |
| 32°F | Oct 7 | Oct 20 | Nov 5 |
| 28°F | Oct 18 | Nov 2 | Nov 16 |
| 24°F | Oct 28 | Nov 13 | Nov 27 |
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 | 124 days | 143 days | 162 days |
| 32°F | 143 days | 165 days | 185 days |
| 28°F | 164 days | 189 days | 215 days |
| 24°F | 190 days | 218 days | 245 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 |
| 86020 | 7b | 5 to 10°F | 30 km |
| 86016 | 6b | -5 to 0°F | 36 km |
| 86052 | 6b | -5 to 0°F | 40 km |
| 86045 | 7b | 5 to 10°F | 65 km |
| 86046 | 7a | 0 to 5°F | 74 km |
| 86001 | 6a | -10 to -5°F | 76 km |
| 86040 | 7b | 5 to 10°F | 80 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 USC00023584, at 36.0353, -111.8303, elevation 2280 m (7,480 ft).
- Data quality: Estimated from nearby stations (2+ years), 9 years of freeze data.
- Average days per year at or below 32°F: 133.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Phantom Rch (25 km)
- Grand Canyon Visitor Center (25 km)
- Bright Angel Ranger Station (29 km)
- Grand Canyon National Park 2 (29 km)
- Grand Canyon National Park Airport (31 km)
- Tuba City (54 km)
- Williams 35 NNW (55 km)
- Wupatki National Monument (70 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.