Last frost date in Concord, NH

Average last frost
May 8

Expect the last frost in Concord around May 8. Frost after May 22 happens in only one year out of ten. The first fall frost usually arrives about October 3, which leaves 146 frost-free days. An early freeze before September 21 happens one year in ten.

Safe after (10% risk)
May 22
Average first frost
Oct 3
Frost-free season
146 days
Hard freeze (28°F) ends
Apr 27
Next 7 nights in Concord

Frost likely tonight, low 30°F

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

  1. ThuOct 2230°frost
  2. FriOct 2326°hard freeze
  3. SatOct 2426°hard freeze
  4. SunOct 2532°frost
  5. MonOct 2639°
  6. TueOct 2733°possible frost
  7. WedOct 2834°possible frost
JanFebMarAprMayJunJulAugSepOctNovDecLast frost May 8First frost Oct 3146 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND146 frost-free days
Frost risk through the year at Concord Municipal Airport, 4.0 miles from Concord.

Planting calendar for Concord

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

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesMay 15–May 29
PumpkinsMay 22–Jun 5
SunflowersMay 8–May 29
CucumbersMay 22–May 29
CornMay 15–May 29
Sweet potatoesMay 29–Jun 12
WatermelonMay 22–Jun 5
Green beansMay 15–Jun 5
ZucchiniMay 15–May 29
OkraMay 29–Jun 12
PeppersMay 22–Jun 5
BasilMay 15–May 29
Butternut squashMay 15–May 29
CantaloupeMay 22–Jun 5
EggplantMay 22–Jun 5
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesApr 10–Apr 24
OnionsMar 27–Apr 17
CarrotsApr 17–May 22
LettuceApr 24–May 15
BroccoliApr 10–Apr 24
BeetsApr 10–May 22
PeasMar 27–Apr 10
CabbageApr 10–Apr 24
RadishesApr 3–May 15
Brussels sproutsApr 24–May 8
SpinachMar 27–Apr 17
CilantroApr 24–May 15
KaleApr 10–Apr 24
Collard greensApr 10–Apr 24
TurnipsApr 10–Apr 24
DillMay 8–May 22
CeleryMay 15–May 22
CauliflowerApr 24–May 8
LeeksApr 24–May 8
Swiss chardApr 24–May 22
ParsleyApr 24–May 15
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsSep 19–Oct 24
GarlicSep 12–Oct 17
Daffodil bulbsSep 5–Oct 17
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesApr 10–Apr 24
AsparagusApr 10–Apr 24

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 27May 8May 22Sep 21Oct 3Oct 16
Hard freeze, 28°FApr 15Apr 27May 9Oct 1Oct 13Oct 30

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 Concord Municipal Airport (USW00014745) sits 4.0 miles from the center of Concord at 346 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 Concord, NH?

The average last frost date in Concord is May 8, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 22.

When is the first frost in Concord?

The first frost in fall usually comes around October 3. One year in ten it arrives before September 21.

How long is the growing season in Concord?

About 146 days between the average last and first frost.

When should I plant tomatoes in Concord?

Plant tomato seedlings outside from May 15 to May 29. Start seeds indoors six to eight weeks earlier.

Nearby in New Hampshire

All 8 cities in New Hampshire