Fairmont, CA Frost Dates & Growing Season

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

Last spring frost
Apr 6
~50% chance of frost after
First fall frost
Nov 29
~50% chance of frost before
Growing season
237 days
frost-free stretch
USDA zone
≈ 9b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Feb 20 Apr 6 May 20
First fall frost Dec 15 Nov 29 Nov 5
Hard freeze (28°F), median last Feb 25 · first Dec 10

Computed from NOAA 1991–2020 climate normals at the FAIRMONT 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 Fairmont

Computed from Fairmont'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 Feb 9 – Feb 23 Apr 13 – Apr 20
🫑 Peppers Jan 26 – Feb 9 Apr 20 – Apr 27
🥬 Lettuce Feb 23 – Mar 9 Mar 9 – Mar 23 Mar 9 – Apr 6
🫛 Peas Feb 23 – Mar 9
🥕 Carrots Mar 16 – Apr 6
🥦 Broccoli Feb 16 – Mar 2 Mar 16 – Mar 30
🥬 Kale Feb 23 – Mar 9 Mar 9 – Mar 23 Mar 9 – Mar 23
🥒 Cucumbers Mar 9 – Mar 16 Apr 13 – Apr 20 Apr 13 – Apr 20
🥒 Zucchini Mar 9 – Mar 16 Apr 13 – Apr 20 Apr 13 – Apr 20
🫘 Green Beans (Bush) Apr 13 – Apr 20
🌽 Sweet Corn Apr 13 – Apr 20
🌿 Basil Feb 23 – Mar 9 Apr 13 – Apr 20 Apr 20 – Apr 27
🧄 Garlic Fall: Oct 18 – Nov 15

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 Fairmont's dates automatically after a lookup.

Reading the season in Fairmont

With roughly 237 frost-free days, Fairmont 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 29 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Fairmont, CA?

The average last spring frost in Fairmont is around Apr 6, 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 Fairmont, CA?

The average first fall frost in Fairmont arrives around Nov 29. 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 Fairmont?

About 237 frost-free days on average, from Apr 6 to Nov 29. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Fairmont 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.