Frost dates for Ogden, IL
At Ogden, the median last spring frost (32°F) is Apr 20 and the median first fall frost is Oct 21, for a typical growing season of 182 days. For a 90% chance that the last frost has passed, wait until May 7. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 20Last spring frost (median)50% chance of 32°F after this date
- May 7Safer planting date10% chance of 32°F after this date
- Oct 21First fall frost (median)50% chance of 32°F by this date
- 182 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 | Apr 18 | May 2 | May 16 |
| 32°F | Apr 7 | Apr 20 | May 7 |
| 28°F | Mar 29 | Apr 9 | Apr 25 |
| 24°F | Mar 14 | Mar 31 | Apr 14 |
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 27 | Oct 12 | Oct 23 |
| 32°F | Oct 8 | Oct 21 | Nov 2 |
| 28°F | Oct 19 | Oct 31 | Nov 14 |
| 24°F | Oct 30 | Nov 11 | Nov 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 | 141 days | 161 days | 180 days |
| 32°F | 160 days | 182 days | 200 days |
| 28°F | 183 days | 203 days | 222 days |
| 24°F | 206 days | 225 days | 246 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 61859 | 6a | -10 to -5°F | 5 km |
| 61873 | 6a | -10 to -5°F | 7 km |
| 61844 | 6a | -10 to -5°F | 8 km |
| 61871 | 6a | -10 to -5°F | 9 km |
| 61857 | 6a | -10 to -5°F | 10 km |
| 61849 | 6a | -10 to -5°F | 11 km |
| 61812 | 6a | -10 to -5°F | 11 km |
| 61877 | 6a | -10 to -5°F | 17 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 USC00116344, at 40.1100, -87.9567, elevation 206 m (675 ft).
- Data quality: Estimated from nearby stations (2+ years), 10 years of freeze data.
- Average days per year at or below 32°F: 118.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Sidell 4n (19 km)
- Champaign 3s (24 km)
- Danville (26 km)
- Rantoul (28 km)
- Champaign Willard Airport (28 km)
- Champaign 9 SW (36 km)
- Paxton 2 WSW (41 km)
- Tuscola (45 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.