Frost dates for Snow Hill 4 N, MD
At Snow Hill 4 N, the median last spring frost (32°F) is Apr 10 and the median first fall frost is Oct 31, for a typical growing season of 202 days. For a 90% chance that the last frost has passed, wait until Apr 28. Nearby ZIP codes are in USDA hardiness zone 7b.
- Apr 10Last spring frost (median)50% chance of 32°F after this date
- Apr 28Safer planting date10% chance of 32°F after this date
- Oct 31First fall frost (median)50% chance of 32°F by this date
- 202 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 7 | Apr 23 | May 10 |
| 32°F | Mar 27 | Apr 10 | Apr 28 |
| 28°F | Mar 12 | Mar 29 | Apr 12 |
| 24°F | Feb 26 | Mar 15 | Mar 31 |
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 7 | Oct 20 | Nov 2 |
| 32°F | Oct 16 | Oct 31 | Nov 14 |
| 28°F | Oct 28 | Nov 11 | Dec 1 |
| 24°F | Nov 7 | Nov 27 | Dec 21 |
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 | 158 days | 180 days | 201 days |
| 32°F | 182 days | 202 days | 223 days |
| 28°F | 208 days | 229 days | 253 days |
| 24°F | 234 days | 258 days | 286 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 |
|---|---|---|---|
| 21863 | 7b | 5 to 10°F | 5 km |
| 21841 | 7b | 5 to 10°F | 8 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 USC00188380, at 38.2317, -75.3761, elevation 9 m (30 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 88.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Salisbury Wicomico Regional Airport (17 km)
- Assateague (23 km)
- Ocean City Muni Airport (24 km)
- Salisbury (24 km)
- Salisbury 2n (27 km)
- Vienna (48 km)
- Royal Oak 2 SSW (89 km)
- Patuxent River NAS (91 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.