Last frost date in Nashua, NH

Average last frost
April 29

The average last frost in Nashua is April 29. By May 11 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about October 8, which leaves 162 frost-free days. An early freeze before September 28 happens one year in ten.

Safe after (10% risk)
May 11
Average first frost
Oct 8
Frost-free season
162 days
Hard freeze (28°F) ends
Apr 16
Next 7 nights in Nashua

Hard freeze likely Fri night, low 27°F

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

  1. ThuOct 2233°possible frost
  2. FriOct 2327°hard freeze
  3. SatOct 2428°hard freeze
  4. SunOct 2534°possible frost
  5. MonOct 2641°
  6. TueOct 2734°possible frost
  7. WedOct 2836°possible frost
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 29First frost Oct 8162 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND162 frost-free days
Frost risk through the year at Nashua Cwsu, 1.1 miles from Nashua.

Planting calendar for Nashua

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 6–May 20
PumpkinsMay 13–May 27
SunflowersApr 29–May 20
CucumbersMay 13–May 20
CornMay 6–May 20
Sweet potatoesMay 20–Jun 3
WatermelonMay 13–May 27
Green beansMay 6–May 27
ZucchiniMay 6–May 20
OkraMay 20–Jun 3
PeppersMay 13–May 27
BasilMay 6–May 20
Butternut squashMay 6–May 20
CantaloupeMay 13–May 27
EggplantMay 13–May 27
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesApr 1–Apr 15
OnionsMar 18–Apr 8
CarrotsApr 8–May 13
LettuceApr 15–May 6
BroccoliApr 1–Apr 15
BeetsApr 1–May 13
PeasMar 18–Apr 1
CabbageApr 1–Apr 15
RadishesMar 25–May 6
Brussels sproutsApr 15–Apr 29
SpinachMar 18–Apr 8
CilantroApr 15–May 6
KaleApr 1–Apr 15
Collard greensApr 1–Apr 15
TurnipsApr 1–Apr 15
DillApr 29–May 13
CeleryMay 6–May 13
CauliflowerApr 15–Apr 29
LeeksApr 15–Apr 29
Swiss chardApr 15–May 13
ParsleyApr 15–May 6
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsSep 24–Oct 29
GarlicSep 17–Oct 22
Daffodil bulbsSep 10–Oct 22
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesApr 1–Apr 15
AsparagusApr 1–Apr 15

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 16Apr 29May 11Sep 28Oct 8Oct 25
Hard freeze, 28°FApr 3Apr 16Apr 28Oct 6Oct 20Nov 5

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 Nashua Cwsu (USC00275703) sits 1.1 miles from the center of Nashua at 180 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 Nashua, NH?

The average last frost date in Nashua is April 29, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 11.

When is the first frost in Nashua?

The first frost in fall usually comes around October 8. One year in ten it arrives before September 28.

How long is the growing season in Nashua?

About 162 days between the average last and first frost.

When should I plant tomatoes in Nashua?

Plant tomato seedlings outside from May 6 to May 20. Start seeds indoors six to eight weeks earlier.

Nearby in New Hampshire

All 8 cities in New Hampshire