Hanford Municipal Airport, CA Frost Dates & Growing Season

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

Last spring frost
Feb 20
~50% chance of frost after
First fall frost
Nov 23
~50% chance of frost before
Growing season
276 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 18 Feb 20 Mar 21
First fall frost Dec 12 Nov 23 Nov 6
Hard freeze (28°F), median last Jan 19 · first Dec 5

Computed from NOAA 1991–2020 climate normals at the HANFORD MUNI 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 Hanford Municipal Airport

Computed from Hanford Municipal 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 Dec 26 – Jan 9 Feb 27 – Mar 6
🫑 Peppers Dec 12 – Dec 26 Mar 6 – Mar 13
🥬 Lettuce Jan 9 – Jan 23 Jan 23 – Feb 6 Jan 23 – Feb 20
🫛 Peas Jan 9 – Jan 23
🥕 Carrots Jan 30 – Feb 20
🥦 Broccoli Jan 2 – Jan 16 Jan 30 – Feb 13
🥬 Kale Jan 9 – Jan 23 Jan 23 – Feb 6 Jan 23 – Feb 6
🥒 Cucumbers Jan 23 – Jan 30 Feb 27 – Mar 6 Feb 27 – Mar 6
🥒 Zucchini Jan 23 – Jan 30 Feb 27 – Mar 6 Feb 27 – Mar 6
🫘 Green Beans (Bush) Feb 27 – Mar 6
🌽 Sweet Corn Feb 27 – Mar 6
🌿 Basil Jan 9 – Jan 23 Feb 27 – Mar 6 Mar 6 – Mar 13
🧄 Garlic Fall: Oct 12 – Nov 9

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 Hanford Municipal Airport's dates automatically after a lookup.

Reading the season in Hanford Municipal Airport

With roughly 276 frost-free days, Hanford Municipal 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 23 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Hanford Municipal Airport, CA?

The average last spring frost in Hanford Municipal Airport is around Feb 20, 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 Hanford Municipal Airport, CA?

The average first fall frost in Hanford Municipal Airport arrives around Nov 23. 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 Hanford Municipal Airport?

About 276 frost-free days on average, from Feb 20 to Nov 23. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Hanford Municipal 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.