Arcata Eureka Airport, CA Frost Dates & Growing Season

The two dates every Arcata Eureka Airport garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Mar 8
~50% chance of frost after
First fall frost
Nov 30
~50% chance of frost before
Growing season
267 days
frost-free stretch
USDA zone
≈ 9b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Jan 13 Mar 8 Apr 15
First fall frost Jan 4 Nov 30 Nov 1
Hard freeze (28°F), median last Jan 20 · first Dec 24

Computed from NOAA 1991–2020 climate normals at the ARCATA EUREKA AP station. "Safe" means frost past that date happens only about one year in ten. Your exact garden can still run days either way with elevation and terrain — check your own ZIP with the frost date lookup.

Planting windows for Arcata Eureka Airport

Computed from Arcata Eureka Airport's own frost dates. Click any crop for the full zone-9 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Jan 11 – Jan 25 Mar 15 – Mar 22
🫑 Peppers Dec 28 – Jan 11 Mar 22 – Mar 29
🥬 Lettuce Jan 25 – Feb 8 Feb 8 – Feb 22 Feb 8 – Mar 8
🫛 Peas Jan 25 – Feb 8
🥕 Carrots Feb 15 – Mar 8
🥦 Broccoli Jan 18 – Feb 1 Feb 15 – Mar 1
🥬 Kale Jan 25 – Feb 8 Feb 8 – Feb 22 Feb 8 – Feb 22
🥒 Cucumbers Feb 8 – Feb 15 Mar 15 – Mar 22 Mar 15 – Mar 22
🥒 Zucchini Feb 8 – Feb 15 Mar 15 – Mar 22 Mar 15 – Mar 22
🫘 Green Beans (Bush) Mar 15 – Mar 22
🌽 Sweet Corn Mar 15 – Mar 22
🌿 Basil Jan 25 – Feb 8 Mar 15 – Mar 22 Mar 22 – Mar 29
🧄 Garlic Fall: Oct 19 – Nov 16

Want this for all 50 crops, or as a printable seed-shelf schedule? Use the planting calendar and the seed starting scheduler — both can use Arcata Eureka Airport's dates automatically after a lookup.

Reading the season in Arcata Eureka Airport

With roughly 267 frost-free days, Arcata Eureka Airport gardens fit long-season crops — melons, winter squash, sweet potatoes — with room left for spring and fall rounds of greens and roots. The first frost around Nov 30 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Arcata Eureka Airport, CA?

The average last spring frost in Arcata Eureka Airport is around Mar 8, based on 1991–2020 climate normals. That's a median — about half of years see a later frost, so tender crops are safest going out a week or two after this date.

When is the first frost in Arcata Eureka Airport, CA?

The average first fall frost in Arcata Eureka Airport arrives around Nov 30. Crops still in the garden need to mature before then, and frost-tender plants need harvesting or protection as the date approaches.

How long is the growing season in Arcata Eureka Airport?

About 267 frost-free days on average, from Mar 8 to Nov 30. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Arcata Eureka Airport in?

USDA zone 9b on the 2023 Plant Hardiness Zone Map. Note that zones describe winter cold, not frost timing — these frost dates are the numbers to plan plantings around.