Frost Dates for New Plymouth, ID

Based on data from Ontario Ksrv weather station, 9 miles away

Elevation: 2260 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 22
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 9

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 29
First Fall Frost October 4

Hard Freeze (28°F)

Last Spring Hard Freeze April 6
First Fall Hard Freeze October 21
43.97°N, 116.82°W © OpenStreetMap

Growing Season

170 Days April 22 to October 9

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 7a

Avg. annual minimum: 0 to 5°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
BSk Cold Semi-Arid (Steppe)

Cool to cold with low rainfall and wide temperature swings. Common in the western Great Plains and central Asia. Short growing seasons benefit from season extension techniques.

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
January36°29°23°
February44°35°26°
March56°44°32°
April63°51°38°
May74°60°47°
June82°68°54°
July93°77°60°
August91°74°57°
September81°64°47°
October65°50°36°
November47°37°28°
December36°29°22°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January3.3
February2.1
March2.2
April2.3
May3.5
June2.0
July0.0
August0.0
September0.7
October2.4
November2.3
December3.3

Sunrise / Sunset

Daylight Mountain Time (MT) Longest: 15h 18m · Shortest: 8h 42m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month Sunrise Sunset Daylight
January8:26 AM5:29 PM9h 03m
February7:55 AM6:10 PM10h 14m
March8:08 AM7:47 PM11h 38m
April7:11 AM8:25 PM13h 14m
May6:27 AM9:01 PM14h 34m
June6:10 AM9:27 PM15h 17m
July6:24 AM9:23 PM14h 59m
August6:57 AM8:47 PM13h 50m
September7:34 AM7:51 PM12h 17m
October8:11 AM6:55 PM10h 45m
November7:51 AM5:15 PM9h 23m
December8:22 AM5:05 PM8h 43m

Nearby Stations

Ontario Muni AP, OR April 21 - October 14 Payette, IDApril 19 - October 20 Malheur Branch Exp Stn, OR April 23 - October 13 Nyssa, ORApril 18 - October 18 Weiser, IDApril 23 - October 13 Vale, ORMay 8 - September 29

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