Frost Dates for Alpena, MI

Based on data from Alpena Wwtp weather station, 0 miles away

Elevation: 591 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 5
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 17

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 13
First Fall Frost October 10

Hard Freeze (28°F)

Last Spring Hard Freeze April 23
First Fall Hard Freeze October 31
45.06°N, 83.43°W © OpenStreetMap

Growing Season

165 Days May 5 to October 17

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 6a

Avg. annual minimum: −10 to −5°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
January27°20°13°
February29°21°13°
March37°29°21°
April48°40°32°
May61°52°43°
June71°62°54°
July77°68°59°
August76°67°58°
September69°60°51°
October56°48°40°
November43°37°30°
December33°27°21°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January1.1
February0.9
March1.4
April2.6
May3.1
June3.0
July3.3
August3.4
September3.0
October2.2
November1.6
December1.2

Sunrise / Sunset

Daylight Eastern Time (ET) Longest: 15h 26m · Shortest: 8h 34m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Eastern Time (ET))
Month Sunrise Sunset Daylight
January8:15 AM5:11 PM8h 56m
February7:43 AM5:54 PM10h 10m
March7:55 AM7:32 PM11h 37m
April6:56 AM8:12 PM13h 17m
May6:10 AM8:50 PM14h 39m
June5:52 AM9:16 PM15h 25m
July6:06 AM9:12 PM15h 06m
August6:41 AM8:35 PM13h 54m
September7:19 AM7:37 PM12h 18m
October7:58 AM6:40 PM10h 42m
November7:40 AM4:57 PM9h 17m
December8:12 AM4:47 PM8h 35m

Nearby Stations

Alpena Co Rgnl AP, MI May 17 - October 1 Alpena 10nw, MIMay 13 - October 3 Harrisville 2nne, MI May 8 - October 16 Rogers City, MI May 10 - October 14 Atlanta, MIMay 22 - September 27 Glennie 2se, MI May 19 - September 29

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