Frost dates for Cody 21 SW, WY
At Cody 21 SW, the median last spring frost (32°F) is May 29 and the median first fall frost is Sep 18, for a typical growing season of 110 days. For a 90% chance that the last frost has passed, wait until Jun 17. Nearby ZIP codes are in USDA hardiness zones 4b to 5a.
- May 29Last spring frost (median)50% chance of 32°F after this date
- Jun 17Safer planting date10% chance of 32°F after this date
- Sep 18First fall frost (median)50% chance of 32°F by this date
- 110 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 2 | Jun 17 | Jul 3 |
| 32°F | May 11 | May 29 | Jun 17 |
| 28°F | Apr 29 | May 12 | May 30 |
| 24°F | Apr 17 | May 1 | May 17 |
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 | Aug 21 | Sep 5 | Sep 20 |
| 32°F | Sep 3 | Sep 18 | Oct 3 |
| 28°F | Sep 14 | Sep 29 | Oct 15 |
| 24°F | Sep 22 | Oct 9 | Oct 26 |
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 | 54 days | 79 days | 100 days |
| 32°F | 86 days | 110 days | 133 days |
| 28°F | 116 days | 139 days | 160 days |
| 24°F | 139 days | 160 days | 182 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 |
|---|---|---|---|
| 82414 | 5a | -20 to -15°F | 19 km |
| 82450 | 5a | -20 to -15°F | 19 km |
| 82433 | 4b | -25 to -20°F | 38 km |
| 82440 | 5a | -20 to -15°F | 59 km |
| 82435 | 5a | -20 to -15°F | 60 km |
| 82411 | 5a | -20 to -15°F | 74 km |
| 82513 | 4b | -25 to -20°F | 81 km |
| 82422 | 5a | -20 to -15°F | 82 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 USC00481855, at 44.3367, -109.3914, elevation 1780 m (5,840 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 175.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Wapiti 1wsw (14 km)
- Buffalo Bill Dam (26 km)
- Cody (29 km)
- Cody 12se (40 km)
- Sunshine 3ne (45 km)
- Pahaska (49 km)
- Yellowstone National Park E Ent (51 km)
- Heart Mountain (54 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.