Frost Dates for Forest Grove, OR

Frost Dates

Last Spring Frost (50%) iA 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. April 16
First Fall Frost (50%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. October 26
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly 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 / -2°C)

Last Spring Hard Freeze March 19
First Fall Hard Freeze November 11
45.52°N, -123.10°W © OpenStreetMap

Growing Season

193 Days April 16 to October 26

USDA Hardiness Zone iHardiness 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 8b

Learn more

Temperature

30° 50° 70° 90°
39°
High: 45°
Avg: 39°
Low: 33°
Jan
41°
High: 49°
Avg: 41°
Low: 33°
Feb
45°
High: 55°
Avg: 45°
Low: 36°
Mar
50°
High: 60°
Avg: 50°
Low: 39°
Apr
57°
High: 68°
Avg: 57°
Low: 45°
May
61°
High: 73°
Avg: 61°
Low: 50°
Jun
68°
High: 81°
Avg: 68°
Low: 54°
Jul
68°
High: 82°
Avg: 68°
Low: 54°
Aug
62°
High: 76°
Avg: 62°
Low: 49°
Sep
53°
High: 63°
Avg: 53°
Low: 42°
Oct
44°
High: 51°
Avg: 44°
Low: 36°
Nov
38°
High: 44°
Avg: 38°
Low: 33°
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 2" 4" 6" 7.6"
6.8"
6.83"
Jan
5.3"
5.35"
Feb
4.8"
4.84"
Mar
3.7"
3.74"
Apr
4.2"
4.15"
May
2.9"
2.87"
Jun
1.0"
0.96"
Jul
1.2"
1.17"
Aug
3.4"
3.36"
Sep
4.6"
4.64"
Oct
7.0"
7.05"
Nov
7.6"
7.64"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h12h13h15h15h15h14h12h11h9h9h
Jan: 7:33 AM – 4:27 PM · 8h 53m
Feb: 6:56 AM – 5:04 PM · 10h 09m
Mar: 6:11 AM – 5:49 PM · 11h 37m
Apr: 5:21 AM – 6:39 PM · 13h 18m
May: 4:39 AM – 7:21 PM · 14h 42m
Jun: 4:16 AM – 7:44 PM · 15h 28m
Jul: 4:25 AM – 7:35 PM · 15h 09m
Aug: 5:02 AM – 6:58 PM · 13h 56m
Sep: 5:51 AM – 6:09 PM · 12h 18m
Oct: 6:40 AM – 5:20 PM · 10h 41m
Nov: 7:23 AM – 4:37 PM · 9h 14m
Dec: 7:44 AM – 4:16 PM · 8h 31m
Daylight Longest: 15h 30m · Shortest: 8h 30m

Nearby Stations

Portland-Hillsboro AP, OR April 16 - October 23 Nature Park-Beaverton, OR February 11 - December 5 Beaverton 2 Ssw, OR April 1 - November 6 Rex 1 S, ORMarch 21 - November 22 Portland Kgw-Tv, OR February 25 - December 1 Scappoose Ind AP, OR April 10 - November 2

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