Frost dates for Norwood #2, CO
At Norwood #2, the median last spring frost (32°F) is May 21 and the median first fall frost is Oct 1, for a typical growing season of 131 days. For a 90% chance that the last frost has passed, wait until Jun 5. Nearby ZIP codes are in USDA hardiness zones 5b to 6b.
- May 21Last spring frost (median)50% chance of 32°F after this date
- Jun 5Safer planting date10% chance of 32°F after this date
- Oct 1First fall frost (median)50% chance of 32°F by this date
- 131 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 21 | Jun 1 | Jun 15 |
| 32°F | May 7 | May 21 | Jun 5 |
| 28°F | Apr 26 | May 8 | May 24 |
| 24°F | Apr 12 | Apr 27 | May 12 |
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 10 | Sep 23 | Oct 3 |
| 32°F | Sep 19 | Oct 1 | Oct 12 |
| 28°F | Sep 27 | Oct 8 | Oct 20 |
| 24°F | Oct 4 | Oct 17 | Oct 30 |
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 | 94 days | 112 days | 129 days |
| 32°F | 111 days | 131 days | 149 days |
| 28°F | 133 days | 152 days | 170 days |
| 24°F | 151 days | 171 days | 191 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 |
|---|---|---|---|
| 81423 | 6a | -10 to -5°F | 18 km |
| 81431 | 6b | -5 to 0°F | 20 km |
| 81430 | 5b | -15 to -10°F | 21 km |
| 81424 | 6a | -10 to -5°F | 30 km |
| 81403 | 6a | -10 to -5°F | 37 km |
| 81425 | 6b | -5 to 0°F | 39 km |
| 81422 | 6b | -5 to 0°F | 43 km |
| 81435 | 5b | -15 to -10°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 USC00056013, at 38.1314, -108.2850, elevation 2137 m (7,011 ft).
- Data quality: Estimated from nearby stations (2+ years), 5 years of freeze data.
- Average days per year at or below 32°F: 187.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Norwood (0 km)
- Placerville (24 km)
- Telluride 4wnw (41 km)
- Ridgway (46 km)
- Uravan (48 km)
- Montrose #2 (53 km)
- Montrose Regional Airport (54 km)
- Ouray #2 (55 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.