Frost dates for Rio Grande Rsvr, CO
At Rio Grande Rsvr, the median last spring frost (32°F) is Jun 15 and the median first fall frost is Sep 11, for a typical growing season of 85 days. For a 90% chance that the last frost has passed, wait until Jun 30. Nearby ZIP codes are in USDA hardiness zones 5a to 6a.
- Jun 15Last spring frost (median)50% chance of 32°F after this date
- Jun 30Safer planting date10% chance of 32°F after this date
- Sep 11First fall frost (median)50% chance of 32°F by this date
- 85 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 |
|---|---|---|---|
| 32°F | Jun 2 | Jun 15 | Jun 30 |
| 28°F | May 14 | May 31 | Jun 16 |
| 24°F | May 3 | May 12 | Jun 1 |
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 |
|---|---|---|---|
| 32°F | Aug 27 | Sep 11 | Sep 23 |
| 28°F | Sep 11 | Sep 23 | Oct 5 |
| 24°F | Sep 20 | Oct 3 | Oct 16 |
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 | 29 days | 53 days | 73 days |
| 32°F | 66 days | 85 days | 104 days |
| 28°F | 94 days | 115 days | 135 days |
| 24°F | 120 days | 142 days | 160 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 |
|---|---|---|---|
| 81130 | 5a | -20 to -15°F | 15 km |
| 81433 | 5a | -20 to -15°F | 28 km |
| 81235 | 5a | -20 to -15°F | 30 km |
| 81427 | 5b | -15 to -10°F | 45 km |
| 81147 | 5b | -15 to -10°F | 51 km |
| 81426 | 5b | -15 to -10°F | 51 km |
| 81122 | 6a | -10 to -5°F | 52 km |
| 81301 | 6a | -10 to -5°F | 53 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 USC00057050, at 37.7219, -107.2667, elevation 2893 m (9,492 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 256.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Hermit 8 SE (15 km)
- Santa Maria Rsvr (18 km)
- Creede Water Plant (32 km)
- Creede (33 km)
- Lake City (34 km)
- Silverton (36 km)
- Lake City 1nne (37 km)
- Vallecito Reservoir (47 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.