Frost dates for Washington Wastewater Plant 4w, NC
At Washington Wastewater Plant 4w, the median last spring frost (32°F) is Mar 22 and the median first fall frost is Nov 15, for a typical growing season of 237 days. For a 90% chance that the last frost has passed, wait until Apr 7. Nearby ZIP codes are in USDA hardiness zones 8a to 8b.
- Mar 22Last spring frost (median)50% chance of 32°F after this date
- Apr 7Safer planting date10% chance of 32°F after this date
- Nov 15First fall frost (median)50% chance of 32°F by this date
- 237 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 | Mar 18 | Apr 3 | Apr 19 |
| 32°F | Mar 5 | Mar 22 | Apr 7 |
| 28°F | Feb 15 | Mar 8 | Mar 27 |
| 24°F | Jan 25 | Feb 22 | Mar 15 |
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 | Oct 26 | Nov 5 | Nov 19 |
| 32°F | Nov 3 | Nov 15 | Dec 1 |
| 28°F | Nov 11 | Nov 27 | Dec 23 |
| 24°F | Nov 23 | Dec 13 | Jan 14 |
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 | 198 days | 215 days | 236 days |
| 32°F | 216 days | 237 days | 262 days |
| 28°F | 239 days | 265 days | 294 days |
| 24°F | 266 days | 297 days | 331 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 99% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 27889 | 8b | 15 to 20°F | 5 km |
| 27817 | 8b | 15 to 20°F | 11 km |
| 27837 | 8b | 15 to 20°F | 13 km |
| 27865 | 8a | 10 to 15°F | 20 km |
| 28586 | 8b | 15 to 20°F | 27 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 USC00319100, at 35.5525, -77.0722, elevation 3 m (10 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 47.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Greenville (31 km)
- Aurora 6 N (32 km)
- Williamston 1 E (34 km)
- Belhaven 3 NE (44 km)
- Reelsboro (49 km)
- Plymouth 5 E (52 km)
- Bayboro 3 SW (52 km)
- Kinston Ag Rsch (53 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.
All North Carolina stations · How frost dates are calculated