Frost Dates for Calais, ME

Based on data from Woodland weather station, 6 miles away

Elevation: 43 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. April 21
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 26

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 April 26
First Fall Frost October 18

Hard Freeze (28°F)

Last Spring Hard Freeze April 10
First Fall Hard Freeze November 7
45.18°N, 67.28°W © OpenStreetMap

Growing Season

188 Days April 21 to October 26

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
January28°21°13°
February31°23°14°
March39°32°24°
April52°44°36°
May64°55°46°
June74°65°56°
July80°71°62°
August79°70°61°
September71°61°52°
October58°50°42°
November46°39°33°
December35°28°22°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January6.2
February5.8
March6.7
April6.2
May5.4
June4.8
July4.7
August4.7
September5.5
October8.2
November6.8
December6.8

Sunrise / Sunset

Daylight Eastern Time (ET) Longest: 15h 27m · Shortest: 8h 33m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Eastern Time (ET))
Month Sunrise Sunset Daylight
January7:11 AM4:07 PM8h 56m
February6:39 AM4:49 PM10h 10m
March6:51 AM6:28 PM11h 37m
April5:51 AM7:08 PM13h 17m
May5:06 AM7:46 PM14h 40m
June4:47 AM8:12 PM15h 25m
July5:02 AM8:09 PM15h 07m
August5:37 AM7:31 PM13h 54m
September6:15 AM6:33 PM12h 18m
October6:54 AM5:36 PM10h 42m
November6:36 AM3:53 PM9h 17m
December7:08 AM3:43 PM8h 34m

Nearby Stations

Robbinston, MEMay 5 - October 13 Grand Lake Stream, ME May 4 - October 10 Wesley, MEMay 2 - October 15 Topsfield 2, MEMay 6 - October 8 Eastport, MEApril 29 - October 25 Vanceboro No 2, ME May 13 - October 1

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