Frost Dates for Marlborough, NH

Based on data from Keene weather station, 6 miles away

Elevation: 705 ft

Frost Dates

Last Spring Frost (50%) A 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. May 14
First Fall Frost (50%) A 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. October 1

30% Probability

Only a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.
Last Spring Frost May 19
First Fall Frost September 26

Hard Freeze (28°F)

Last Spring Hard Freeze May 2
First Fall Hard Freeze October 10
42.90°N, 72.21°W © OpenStreetMap

Growing Season

140 Days May 14 to October 1

USDA Hardiness Zone

Hardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.
Zone 5b

Avg. annual minimum: −15 to −10°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Dfb Warm-Summer Continental

Warm summers and cold, snowy winters. A shorter growing season than hot-summer continental. Hardy vegetables, root crops, and cool-season greens do well. Season extension is valuable.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January30°20°10°
February34°23°11°
March43°31°20°
April57°43°30°
May69°55°41°
June77°64°51°
July82°69°56°
August81°67°54°
September73°60°47°
October60°48°36°
November47°37°27°
December36°27°18°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January4.5
February4.3
March5.1
April5.3
May4.6
June4.8
July5.6
August5.9
September5.8
October5.6
November5.2
December5.2

Sunrise / Sunset

Daylight Eastern Time (ET) Longest: 15h 10m · Shortest: 8h 50m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Eastern Time (ET))
Month Sunrise Sunset Daylight
January7:24 AM4:34 PM9h 10m
February6:55 AM5:13 PM10h 18m
March7:09 AM6:48 PM11h 39m
April6:14 AM7:25 PM13h 11m
May5:32 AM7:59 PM14h 28m
June5:15 AM8:24 PM15h 09m
July5:29 AM8:21 PM14h 52m
August6:01 AM7:46 PM13h 46m
September6:36 AM6:52 PM12h 17m
October7:11 AM5:58 PM10h 48m
November6:50 AM4:19 PM9h 29m
December7:20 AM4:10 PM8h 51m

Nearby Stations

Walpole 2s Nepp, NH May 8 - October 3 Jaffrey Silver Rch Airpark, NH May 5 - October 6 Jaffrey Muni AP, NH May 5 - October 6 Tully Lake, MA April 25 - October 17 Birch Hill Dam, MA May 6 - October 1 Orange Muni AP, MA May 4 - October 8

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