Frost Dates for Oak Grove, OR

Based on data from Oregon City weather station, 5 miles away

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. March 18
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. November 18
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 March 27
First Fall Frost November 9

Hard Freeze (28°F)

Last Spring Hard Freeze February 12
First Fall Hard Freeze December 8
45.42°N, -122.64°W © OpenStreetMap

Growing Season

245 Days March 18 to November 18

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

Avg. annual minimum: 15 to 20°F (−9 to −7°C)

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

Csb Warm-Summer Mediterranean

Warm, dry summers and mild, wet winters. Similar to hot-summer Mediterranean but cooler. Great for a wide range of vegetables and fruit trees with moderate water needs.

Köppen climate map

Temperature

30° 50° 70° 90°
43°
High: 48°F
Avg: 43°F
Low: 37°F
Jan
45°
High: 53°F
Avg: 45°F
Low: 38°F
Feb
49°
High: 58°F
Avg: 49°F
Low: 40°F
Mar
53°
High: 64°F
Avg: 53°F
Low: 43°F
Apr
60°
High: 71°F
Avg: 60°F
Low: 48°F
May
65°
High: 76°F
Avg: 65°F
Low: 53°F
Jun
70°
High: 84°F
Avg: 70°F
Low: 57°F
Jul
71°
High: 84°F
Avg: 71°F
Low: 58°F
Aug
65°
High: 78°F
Avg: 65°F
Low: 53°F
Sep
56°
High: 65°F
Avg: 56°F
Low: 47°F
Oct
47°
High: 53°F
Avg: 47°F
Low: 41°F
Nov
42°
High: 47°F
Avg: 42°F
Low: 36°F
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 2" 4" 6" 7.5"
6.2"
6.15"
Jan
5.3"
5.32"
Feb
5.2"
5.19"
Mar
3.9"
3.93"
Apr
4.2"
4.16"
May
3.4"
3.44"
Jun
1.6"
1.58"
Jul
1.9"
1.87"
Aug
3.7"
3.70"
Sep
4.6"
4.61"
Oct
6.1"
6.06"
Nov
7.5"
7.45"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h14.5h15.5h15h14h12.5h10.5h9.5h8.5h
Jan: 7:33 AM – 4:27 PM · 8h 54m
Feb: 6:55 AM – 5:05 PM · 10h 09m
Mar: 6:11 AM – 5:49 PM · 11h 37m
Apr: 5:21 AM – 6:39 PM · 13h 17m
May: 4:39 AM – 7:21 PM · 14h 41m
Jun: 4:17 AM – 7:43 PM · 15h 27m
Jul: 4:26 AM – 7:34 PM · 15h 08m
Aug: 5:02 AM – 6:58 PM · 13h 55m
Sep: 5:51 AM – 6:09 PM · 12h 18m
Oct: 6:39 AM – 5:21 PM · 10h 41m
Nov: 7:22 AM – 4:38 PM · 9h 15m
Dec: 7:44 AM – 4:16 PM · 8h 33m
Daylight Longest: 15h 28m · Shortest: 8h 32m

Nearby Stations

N Willamette Exp Stn, OR March 18 - November 13 Aurora State AP, OR March 16 - November 14 Portland Kgw-Tv, OR February 25 - December 1 Beaverton 2 Ssw, OR April 1 - November 6 Molalla 7ne, OR March 16 - November 19 Portland Wfo, OR March 13 - November 22

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