Frost dates for Millers 4 NE, MD
At Millers 4 NE, the median last spring frost (32°F) is Apr 19 and the median first fall frost is Oct 25, for a typical growing season of 188 days. For a 90% chance that the last frost has passed, wait until May 8. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 19Last spring frost (median)50% chance of 32°F after this date
- May 8Safer planting date10% chance of 32°F after this date
- Oct 25First fall frost (median)50% chance of 32°F by this date
- 188 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 17 | May 2 | May 18 |
| 32°F | Apr 4 | Apr 19 | May 8 |
| 28°F | Mar 22 | Apr 5 | Apr 21 |
| 24°F | Mar 10 | Mar 25 | Apr 6 |
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 1 | Oct 13 | Oct 27 |
| 32°F | Oct 8 | Oct 25 | Nov 7 |
| 28°F | Oct 20 | Nov 4 | Nov 20 |
| 24°F | Nov 2 | Nov 15 | Dec 5 |
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 | 140 days | 162 days | 184 days |
| 32°F | 163 days | 188 days | 208 days |
| 28°F | 193 days | 213 days | 235 days |
| 24°F | 218 days | 238 days | 261 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 |
|---|---|---|---|
| 21102 | 7a | 0 to 5°F | 5 km |
| 17329 | 7a | 0 to 5°F | 6 km |
| 17327 | 7a | 0 to 5°F | 8 km |
| 21053 | 7a | 0 to 5°F | 8 km |
| 17355 | 7a | 0 to 5°F | 10 km |
| 21074 | 7a | 0 to 5°F | 11 km |
| 17311 | 7a | 0 to 5°F | 11 km |
| 17361 | 7a | 0 to 5°F | 12 km |
| 21105 | 7a | 0 to 5°F | 13 km |
| 17349 | 7a | 0 to 5°F | 13 km |
| 21120 | 7a | 0 to 5°F | 14 km |
| 21155 | 7a | 0 to 5°F | 16 km |
| 17363 | 7a | 0 to 5°F | 19 km |
| 21152 | 7a | 0 to 5°F | 21 km |
| 21161 | 7a | 0 to 5°F | 21 km |
| 21111 | 7a | 0 to 5°F | 24 km |
| 21157 | 7a | 0 to 5°F | 25 km |
| 21048 | 7a | 0 to 5°F | 26 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 USC00185934, at 39.7194, -76.8028, elevation 262 m (860 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 101.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Emmitsburg 2 SE (41 km)
- Cylburn (43 km)
- Md Sci Center Baltimore (51 km)
- Conowingo Dam (54 km)
- Catoctin Mountain Park (59 km)
- Aberdeen Phillips Field (61 km)
- Baltimore Wash Intl Airport (62 km)
- Damascus 3 SSW (63 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.