Frost Dates for Rockcreek, OR

Based on data from Portland-Hillsboro AP weather station, 4 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. 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 23
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 25
First Fall Frost October 14

Hard Freeze (28°F)

Last Spring Hard Freeze March 13
First Fall Hard Freeze November 12
45.55°N, -122.88°W © OpenStreetMap

Growing Season

190 Days April 16 to October 23

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°
40°
High: 47°F
Avg: 40°F
Low: 34°F
Jan
42°
High: 51°F
Avg: 42°F
Low: 34°F
Feb
46°
High: 56°F
Avg: 46°F
Low: 37°F
Mar
50°
High: 61°F
Avg: 50°F
Low: 39°F
Apr
57°
High: 69°F
Avg: 57°F
Low: 45°F
May
61°
High: 74°F
Avg: 61°F
Low: 49°F
Jun
67°
High: 82°F
Avg: 67°F
Low: 52°F
Jul
67°
High: 82°F
Avg: 67°F
Low: 52°F
Aug
62°
High: 76°F
Avg: 62°F
Low: 48°F
Sep
52°
High: 64°F
Avg: 52°F
Low: 41°F
Oct
45°
High: 53°F
Avg: 45°F
Low: 37°F
Nov
40°
High: 46°F
Avg: 40°F
Low: 33°F
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 2" 4" 5.4"
4.7"
4.74"
Jan
3.9"
3.92"
Feb
4.1"
4.07"
Mar
2.9"
2.86"
Apr
3.1"
3.08"
May
2.3"
2.30"
Jun
0.6"
0.62"
Jul
1.0"
1.02"
Aug
2.2"
2.21"
Sep
3.1"
3.12"
Oct
4.4"
4.36"
Nov
5.4"
5.39"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h14.5h15.5h15h14h12.5h10.5h9h8.5h
Jan: 7:33 AM – 4:27 PM · 8h 53m
Feb: 6:56 AM – 5:04 PM · 10h 09m
Mar: 6:12 AM – 5:48 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 10m
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

Nature Park-Beaverton, OR February 11 - December 5 Forest Grove, OR April 16 - October 26 Beaverton 2 Ssw, OR April 1 - November 6 Portland Kgw-Tv, OR February 25 - December 1 Vancouver Pearson AP, WA March 29 - November 9 Rex 1 S, ORMarch 21 - November 22

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