Last frost date in Rochester, NH

Average last frost
April 30

The average last frost in Rochester is April 30. By May 13 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about October 9, which leaves 161 frost-free days. An early freeze before September 27 happens one year in ten.

Safe after (10% risk)
May 13
Average first frost
Oct 9
Frost-free season
161 days
Hard freeze (28°F) ends
Apr 17
Next 7 nights in Rochester

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 2640°
  6. TueOct 2733°possible frost
  7. WedOct 2835°possible frost
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 30First frost Oct 9161 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND161 frost-free days
Frost risk through the year at Rochester Skyhaven Airport, 3.1 miles from Rochester.

Planting calendar for Rochester

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 7–May 21
PumpkinsMay 14–May 28
SunflowersApr 30–May 21
CucumbersMay 14–May 21
CornMay 7–May 21
Sweet potatoesMay 21–Jun 4
WatermelonMay 14–May 28
Green beansMay 7–May 28
ZucchiniMay 7–May 21
OkraMay 21–Jun 4
PeppersMay 14–May 28
BasilMay 7–May 21
Butternut squashMay 7–May 21
CantaloupeMay 14–May 28
EggplantMay 14–May 28
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesApr 2–Apr 16
OnionsMar 19–Apr 9
CarrotsApr 9–May 14
LettuceApr 16–May 7
BroccoliApr 2–Apr 16
BeetsApr 2–May 14
PeasMar 19–Apr 2
CabbageApr 2–Apr 16
RadishesMar 26–May 7
Brussels sproutsApr 16–Apr 30
SpinachMar 19–Apr 9
CilantroApr 16–May 7
KaleApr 2–Apr 16
Collard greensApr 2–Apr 16
TurnipsApr 2–Apr 16
DillApr 30–May 14
CeleryMay 7–May 14
CauliflowerApr 16–Apr 30
LeeksApr 16–Apr 30
Swiss chardApr 16–May 14
ParsleyApr 16–May 7
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsSep 25–Oct 30
GarlicSep 18–Oct 23
Daffodil bulbsSep 11–Oct 23
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesApr 2–Apr 16
AsparagusApr 2–Apr 16

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 18Apr 30May 13Sep 27Oct 9Oct 25
Hard freeze, 28°FApr 4Apr 17Apr 29Oct 7Oct 23Nov 7

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 Rochester Skyhaven Airport (USW00054791) sits 3.1 miles from the center of Rochester at 323 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 Rochester, NH?

The average last frost date in Rochester is April 30, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 13.

When is the first frost in Rochester?

The first frost in fall usually comes around October 9. One year in ten it arrives before September 27.

How long is the growing season in Rochester?

About 161 days between the average last and first frost.

When should I plant tomatoes in Rochester?

Plant tomato seedlings outside from May 7 to May 21. Start seeds indoors six to eight weeks earlier.

Nearby in New Hampshire

All 8 cities in New Hampshire