Frost dates in Maryland

Across Maryland's 43 NOAA stations with a frost every year, the typical last spring frost ranges from March 22 at Solomons (10 feet above sea level) to May 9 at Sines Deep Creek (2,040 feet above sea level). The middle station's date is April 8.

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Last frost across Maryland

The frost-free season runs from 155 days at Sines Deep Creek to 248 days at Solomons.

The station with the latest frost sits about 2,000 feet higher than the one with the earliest.

These are typical dates: in half of springs the last frost comes later. Each place's page, and each ZIP code lookup, also gives the late-year date, after which only 1 spring in 10 has a frost. That's the safer date for tender plants.

Frost dates for Maryland's larger places

Typical (1-in-2) dates. Each place's page has the early and late years, a planting calendar and a printable planner. Zones are for the ZIP code nearest each place's center.

Hardiness zones in Maryland

Maryland's 598 ZIP codes in the USDA list fall in zones 6a to 8a: 6a (2 percent), 6b (1 percent), 7a (16 percent), 7b (61 percent) and 8a (20 percent). Compared with the 2012 map, 76 percent of them moved to a warmer half zone (6 by a full zone or more), 24 percent stayed the same and 1 moved to a colder one.

A hardiness zone is about the coldest night of winter, which decides which shrubs, trees and perennials survive. Frost dates are about spring and fall, which decide when to plant. You need both. Read more about what the zones mean and what changed in 2023.

Every NOAA station in Maryland

All 43 stations in Maryland with frost statistics in NOAA's 1991 to 2020 normals, from A to Z. Station names are usually a town, an airport, or a distance and direction from a town. Find one near you and at a similar elevation.

Typical (1-in-2) dates at 32°F. For the early and late years, and a planting calendar built from your own dates, look up your ZIP code.