Frost Dates for Promontory, BC

Based on data from Sardis weather station, 2 miles away

Elevation: 120 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. April 6
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 30

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 15
First Fall Frost October 26

Hard Freeze (−2°C)

Last Spring Hard Freeze March 2
First Fall Hard Freeze November 24
49.10°N, 121.94°W © OpenStreetMap

Growing Season

207 Days April 6 to October 30

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 8a

Avg. annual minimum: −12 to −9°C

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Cfb Oceanic (Marine West Coast)

Mild year-round with cool summers and wet winters. Excellent for cool-season crops like brassicas, peas, and root vegetables. Extended harvest seasons but summer heat-loving crops may struggle.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low Light Frost (0°C) Hard Frost (−2°C)
Temperature table
Average monthly temperatures (°C)
Month Avg High Avg Temp Avg Low
January6°3°0°
February9°5°1°
March11°7°2°
April15°10°5°
May18°13°8°
June20°15°10°
July24°18°12°
August24°18°12°
September21°15°9°
October15°10°6°
November9°6°2°
December5°3°0°

Precipitation

Precipitation table
Average monthly precipitation (millimeters)
MonthPrecipitation
January211
February117
March155
April114
May86
June97
July56
August53
September71
October145
November229
December198

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 16h 00m · Shortest: 7h 60m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January8:04 AM4:30 PM8h 27m
February7:25 AM5:19 PM9h 53m
March7:30 AM7:04 PM11h 34m
April6:24 AM7:52 PM13h 28m
May5:31 AM8:36 PM15h 05m
June5:09 AM9:07 PM15h 59m
July5:25 AM9:01 PM15h 36m
August6:06 AM8:18 PM14h 12m
September6:52 AM7:12 PM12h 20m
October7:38 AM6:08 PM10h 30m
November7:27 AM4:18 PM8h 51m
December8:03 AM4:04 PM8h 01m

Nearby Stations

Chilliwack, BC April 10 - October 31 Chilliwack R Hatchery, BC April 15 - October 26 Agassiz Cda, BC March 23 - November 14 Agassiz Cs, BC March 20 - November 15 Mission West Abbey, BC March 21 - November 18 Clearbrook, WA April 18 - October 18

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