Last frost date in Fort Washington, MD

Average last frost
April 3

Expect the last frost in Fort Washington around April 3. Frost after April 15 happens in only one year out of ten. The first fall frost usually arrives about November 8, which leaves 217 frost-free days. An early freeze before October 24 happens one year in ten.

Safe after (10% risk)
Apr 15
Average first frost
Nov 8
Frost-free season
217 days
Hard freeze (28°F) ends
Mar 21
Next 7 nights in Fort Washington

No frost in the next 7 nights

National Weather Service forecast, updated Oct 22, 12:57 UTC

  1. ThuOct 2246°
  2. FriOct 2339°
  3. SatOct 2440°
  4. SunOct 2541°
  5. MonOct 2646°
  6. TueOct 2749°
  7. WedOct 2849°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 3First frost Nov 8217 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND217 frost-free days
Frost risk through the year at Oxon Hill, 4.5 miles from Fort Washington.

Planting calendar for Fort Washington

Windows count forward or back from the average frost dates above. Click a crop for dates across Maryland.

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesApr 10–Apr 24
PumpkinsApr 17–May 1
SunflowersApr 3–Apr 24
CucumbersApr 17–Apr 24
CornApr 10–Apr 24
Sweet potatoesApr 24–May 8
WatermelonApr 17–May 1
Green beansApr 10–May 1
ZucchiniApr 10–Apr 24
OkraApr 24–May 8
PeppersApr 17–May 1
BasilApr 10–Apr 24
Butternut squashApr 10–Apr 24
CantaloupeApr 17–May 1
EggplantApr 17–May 1
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesMar 6–Mar 20
OnionsFeb 20–Mar 13
CarrotsMar 13–Apr 17
LettuceMar 20–Apr 10
BroccoliMar 6–Mar 20
BeetsMar 6–Apr 17
PeasFeb 20–Mar 6
CabbageMar 6–Mar 20
RadishesFeb 27–Apr 10
Brussels sproutsMar 20–Apr 3
SpinachFeb 20–Mar 13
CilantroMar 20–Apr 10
KaleMar 6–Mar 20
Collard greensMar 6–Mar 20
TurnipsMar 6–Mar 20
DillApr 3–Apr 17
CeleryApr 10–Apr 17
CauliflowerMar 20–Apr 3
LeeksMar 20–Apr 3
Swiss chardMar 20–Apr 17
ParsleyMar 20–Apr 10
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 25–Nov 29
GarlicOct 18–Nov 22
Daffodil bulbsOct 11–Nov 22
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesMar 6–Mar 20
AsparagusMar 6–Mar 20

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FMar 19Apr 3Apr 15Oct 24Nov 8Nov 23
Hard freeze, 28°FMar 5Mar 21Apr 3Nov 5Nov 19Dec 8

Read the spring 10% column as the date after which only one year in ten still gets frost. That is the safer date for tomatoes, peppers and basil.

Where these numbers come from

NOAA station Oxon Hill (USC00186800) sits 4.5 miles from the center of Fort Washington at 190 feet. Its averages cover 1991 to 2020. Low spots, valleys and open fields can keep getting frost a week or two after the station stops; city centers and lakeshores usually get less of it.

Questions

When is the last frost in Fort Washington, MD?

The average last frost date in Fort Washington is April 3, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 15.

When is the first frost in Fort Washington?

The first frost in fall usually comes around November 8. One year in ten it arrives before October 24.

How long is the growing season in Fort Washington?

About 217 days between the average last and first frost.

When should I plant tomatoes in Fort Washington?

Plant tomato seedlings outside from April 10 to April 24. Start seeds indoors six to eight weeks earlier.

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