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Maryland Frost Dates: Last and First Frost by Town

43 NOAA weather stations · 1991–2020 U.S. Climate Normals · Data updated 2026-10-29

Quick answer

Across Maryland's 43 NOAA stations with regular frost, the median last spring frost is April 8 and the median first fall frost is November 2. Last frost dates range from March 22 at Solomons to May 9 at Sines Deep Creek, so enter your ZIP code below for the station nearest you.

How frost dates vary across Maryland

  • Elevation matters: across Maryland's stations, each 1,000 ft of elevation delays the median last frost by about 14 days.
  • North vs south: stations in the northern third of the state (north of 39.4°N) reach their median last frost about 14 days later than the southern third (south of 38.9°N).
  • Safety margin: the median 10%-risk date (April 24) is about 16 days after the median last frost. Waiting until then cuts the chance of a killing frost on tender transplants from 1 in 2 to 1 in 10.

Frost dates at Maryland's major weather stations

These National Weather Service stations, mostly at airports, have the longest and most complete records in the state.
Aberdeen Phillips Field57Apr 10Apr 30Oct 30201
Annapolis Naf8Mar 23Apr 6Nov 20241
Baltimore Wash Intl Airport156Apr 10Apr 25Oct 31204
Hagerstown Washington County Airport698Apr 7Apr 21Nov 4209
Md Science Center Baltimore20Mar 24Apr 4Nov 21244
Ocean City Municipal Airport12Apr 7Apr 23Nov 2209
Patuxent River NAS39Mar 29Apr 10Nov 15230
Salisbury Wicomico Regional Airport48Apr 10Apr 30Oct 30201
St Inigoes Webster Nolf21Mar 30Apr 11Nov 14229

All 43 stations in Maryland

Last frost and first frost are medians: a 50% chance of a 32°F night after (spring) or before (fall) that date. 10% risk is the spring date with only a 1-in-10 chance of a later frost. Click a column to sort.
Aberdeen Phillips Field57Apr 10Apr 30Oct 30201
Annapolis Naf8Mar 23Apr 6Nov 20241
Annapolis Police Brks25Mar 27Apr 9Nov 13234
Assateague10Mar 31Apr 13Nov 15228
Baltimore Wash Intl Airport156Apr 10Apr 25Oct 31204
Beltsville145Apr 10May 1Nov 1202
Catoctin Mountain Park1,610Apr 14Apr 30Oct 30197
Chestertown40Apr 3Apr 16Nov 5217
Conowingo Dam40Apr 3Apr 18Nov 6217
Cumberland 2730Apr 15May 5Oct 24190
Cylburn235Apr 2Apr 13Nov 7220
Dalecarlia Rsvr150Apr 9Apr 26Oct 31202
Damascus 3 SSW700Apr 14May 2Oct 29196
Emmitsburg 2 SE403Apr 22May 9Oct 20179
Frederick Police Brks380Apr 2Apr 15Nov 6218
Frostburg 22,170Apr 29May 15Oct 18171
Glenn Dale Bell Station150Apr 22May 9Oct 22183
Hagerstown 1 E532Apr 11Apr 27Oct 28199
Hagerstown Washington County Airport698Apr 7Apr 21Nov 4209
Laurel 3 W400Apr 5Apr 19Nov 9218
Md Science Center Baltimore20Mar 24Apr 4Nov 21244
Mechanicsville 5 NE100Apr 17May 2Oct 27195
Millers 4 NE860Apr 19May 8Oct 25188
Natl Arboretum Dc50Mar 29Apr 11Nov 8224
Oakland 1 SE2,420May 6May 23Oct 9156
Ocean City Municipal Airport12Apr 7Apr 23Nov 2209
Oxon Hill190Apr 3Apr 15Nov 8217
Patuxent River NAS39Mar 29Apr 10Nov 15230
Rockville 1 NE440Apr 1Apr 15Nov 6219
Royal Oak 2 SSW10Apr 1Apr 15Nov 7220
Salisbury10Apr 3Apr 25Nov 7217
Salisbury 2N20Apr 2Apr 16Nov 10222
Salisbury Wicomico Regional Airport48Apr 10Apr 30Oct 30201
Savage River Dam1,495Apr 29May 15Oct 20174
Sharpsburg 5 S400Apr 26May 15Oct 18175
Sines Deep Creek2,040May 9May 30Oct 11155
Smithsburg 2NW670Apr 25May 11Oct 19176
Snow Hill 4 N30Apr 10Apr 28Oct 31202
Solomons12Mar 22Apr 5Nov 26248
St Inigoes Webster Nolf21Mar 30Apr 11Nov 14229
Stevensville 2SW10Mar 29Apr 8Nov 12228
Upper Marlboro 3 NNW130Apr 9Apr 24Oct 29203
Vienna10Apr 8Apr 23Nov 4209

Frequently asked questions

When is the last frost in Maryland?

The median last spring frost (32°F) across Maryland's NOAA weather stations is April 8, based on 1991–2020 climate normals. It ranges from March 22 at Solomons to May 9 at Sines Deep Creek. For a safer planting date, use the 10%-risk date; the state median for that is April 24.

When is the first frost in Maryland?

The median first fall frost across Maryland's stations is November 2. The earliest median first frost is October 9 at Oakland 1 SE, and the latest is November 26 at Solomons.

How long is the growing season in Maryland?

The median frost-free season is 209 days across Maryland's stations, from 155 days at Sines Deep Creek to 248 days at Solomons.

When should I plant tomatoes in Maryland?

Plant tomatoes outdoors after your local last frost, ideally after the 10%-risk date when nights stay above 50°F. At a typical Maryland station that means starting seeds indoors 6–8 weeks before April 8 and transplanting from about April 24. Check your ZIP code, because dates vary by weeks across the state.

How to use these dates

Frost dates are 30-year averages from NOAA, not forecasts. Use them to plan seed starting and planting, then watch the 10-day forecast as the date approaches. Cold air settles in valleys and low spots, so a garden at the bottom of a slope can frost a week or more later in spring than the nearest station shows.

Ready to plan? The planting calendar by ZIP code turns these dates into start-indoors, transplant and sowing dates for 30 crops.

Sources and method

Dates are the 32°F freeze probabilities published in the NOAA NCEI 1991–2020 U.S. Climate Normals for each station. Station names are NOAA's, lightly expanded for readability. See the methodology or download the full table.

Frost dates in other states