Frost Dates for Humboldt Hill, CA

Based on data from Eureka Wfo Woodley Island weather station, 6 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. February 22
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. December 7
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 4
First Fall Frost November 28

Hard Freeze (28°F)

Last Spring Hard Freeze January 3
First Fall Hard Freeze December 25
40.73°N, -124.19°W © OpenStreetMap

Growing Season

289 Days February 22 to December 7

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 9b

Avg. annual minimum: 25 to 30°F (−4 to −1°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

40° 50° 60° 70°
48°
High: 55°F
Avg: 48°F
Low: 41°F
Jan
48°
High: 55°F
Avg: 48°F
Low: 41°F
Feb
49°
High: 56°F
Avg: 49°F
Low: 42°F
Mar
51°
High: 57°F
Avg: 51°F
Low: 44°F
Apr
54°
High: 60°F
Avg: 54°F
Low: 48°F
May
56°
High: 62°F
Avg: 56°F
Low: 50°F
Jun
58°
High: 63°F
Avg: 58°F
Low: 52°F
Jul
59°
High: 64°F
Avg: 59°F
Low: 53°F
Aug
57°
High: 64°F
Avg: 57°F
Low: 51°F
Sep
54°
High: 62°F
Avg: 54°F
Low: 47°F
Oct
51°
High: 58°F
Avg: 51°F
Low: 43°F
Nov
47°
High: 55°F
Avg: 47°F
Low: 40°F
Dec
Avg High Avg Temp Avg Low

Precipitation

0" 2" 4" 6" 7.2"
7.2"
7.15"
Jan
6.4"
6.37"
Feb
6.6"
6.60"
Mar
4.7"
4.67"
Apr
2.9"
2.90"
May
1.3"
1.27"
Jun
0.5"
0.54"
Jul
0.6"
0.55"
Aug
1.2"
1.16"
Sep
3.3"
3.32"
Oct
5.3"
5.30"
Nov
7.1"
7.13"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9.5h10.5h11.5h13h14.5h15h14.5h13.5h12.5h11h9.5h9h
Jan: 7:19 AM – 4:41 PM · 9h 23m
Feb: 6:47 AM – 5:13 PM · 10h 26m
Mar: 6:10 AM – 5:50 PM · 11h 41m
Apr: 5:27 AM – 6:33 PM · 13h 06m
May: 4:52 AM – 7:08 PM · 14h 17m
Jun: 4:33 AM – 7:27 PM · 14h 55m
Jul: 4:40 AM – 7:20 PM · 14h 39m
Aug: 5:11 AM – 6:49 PM · 13h 38m
Sep: 5:52 AM – 6:08 PM · 12h 15m
Oct: 6:34 AM – 5:26 PM · 10h 53m
Nov: 7:10 AM – 4:50 PM · 9h 40m
Dec: 7:27 AM – 4:33 PM · 9h 05m
Daylight Longest: 14h 56m · Shortest: 9h 04m

Nearby Stations

Arcata Eureka AP, CA March 8 - November 30 Scotia, CA February 1 - December 19 Grizzly Creek Sp, CA March 4 - November 22 Orick Prairie Creek Park, CA April 12 - November 6 Orleans, CAMarch 12 - November 26 Big Bar 4 E, CA April 16 - October 31

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