Frost dates for Oconto 4 W, WI
At Oconto 4 W, the median last spring frost (32°F) is May 9 and the median first fall frost is Oct 6, for a typical growing season of 150 days. For a 90% chance that the last frost has passed, wait until May 23. Nearby ZIP codes are in USDA hardiness zones 5a to 5b.
- May 9Last spring frost (median)50% chance of 32°F after this date
- May 23Safer planting date10% chance of 32°F after this date
- Oct 6First fall frost (median)50% chance of 32°F by this date
- 150 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 2 |
| 32°F | Apr 25 | May 9 | May 23 |
| 28°F | Apr 12 | Apr 28 | May 14 |
| 24°F | Mar 31 | Apr 15 | 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 11 | Sep 26 | Oct 9 |
| 32°F | Sep 22 | Oct 6 | Oct 19 |
| 28°F | Oct 1 | Oct 17 | Nov 1 |
| 24°F | Oct 14 | Oct 31 | Nov 15 |
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 | 109 days | 129 days | 148 days |
| 32°F | 130 days | 150 days | 170 days |
| 28°F | 152 days | 174 days | 194 days |
| 24°F | 178 days | 198 days | 221 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 |
|---|---|---|---|
| 54153 | 5a | -20 to -15°F | 3 km |
| 54139 | 5a | -20 to -15°F | 12 km |
| 54101 | 5a | -20 to -15°F | 15 km |
| 54154 | 5a | -20 to -15°F | 18 km |
| 54141 | 5b | -15 to -10°F | 18 km |
| 54112 | 5a | -20 to -15°F | 20 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 USC00476208, at 44.8919, -87.9550, elevation 201 m (660 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 169.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Peshtigo (23 km)
- Marinette (35 km)
- Suring (35 km)
- Green Bay Botanical (41 km)
- Green Bay (45 km)
- Green Bay WFO (45 km)
- Sturgeon Bay Exp. Farm (49 km)
- Forestville-4e (49 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.