Frost Dates for Mazama, WA

Elevation: 653 m

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 9
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. September 29

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 14
First Fall Frost September 24

Hard Freeze (28°F)

Last Spring Hard Freeze April 25
First Fall Hard Freeze October 10
48.60°N, 120.43°W © OpenStreetMap

Growing Season

143 Days May 9 to September 29

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.
Dsb Warm-Summer Continental (Dry Summer)

Warm, dry summers and cold, snowy winters. Common in mountain regions. Moderate growing season with irrigation needs in summer.

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
January29°23°16°
February37°28°19°
March46°36°26°
April58°45°33°
May68°55°41°
June75°62°48°
July85°70°55°
August84°69°53°
September74°60°45°
October57°45°34°
November39°32°25°
December28°22°16°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January4.4
February3.4
March3.5
April2.2
May2.0
June2.4
July2.2
August1.8
September1.6
October3.1
November3.8
December4.6

Sunrise / Sunset

Daylight Longest: 15h 56m · Shortest: 8h 04m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January7:45 AM4:15 PM8h 30m
February7:02 AM4:58 PM9h 56m
March6:13 AM5:47 PM11h 34m
April5:17 AM6:43 PM13h 27m
May4:29 AM7:31 PM15h 02m
June4:03 AM7:57 PM15h 54m
July4:14 AM7:46 PM15h 33m
August4:55 AM7:05 PM14h 09m
September5:50 AM6:10 PM12h 20m
October6:44 AM5:16 PM10h 32m
November7:33 AM4:27 PM8h 54m
December7:57 AM4:03 PM8h 06m

Nearby Stations

Winthrop 1 Wsw, WA May 15 - September 22 Stehekin 4 Nw, WA April 27 - October 17 Ross Dam, WAApril 8 - November 10 Holden Village, WA May 25 - September 19 Diablo Dam, WA April 10 - November 1 Newhalem, WAApril 2 - November 14

Plan Your Garden with Planter

Now that you know your frost dates, use Planter to plan your veggie garden! Planter is an easy drag-and-drop garden planner with personalized planting schedules.

Try Planter For Free

Available everywhere: iOS, Android, web, and more!

Planter app garden planner preview