San Jose, CA Frost Dates & Growing Season

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

Last spring frost
Jan 2
~50% chance of frost after
First fall frost
Dec 25
~50% chance of frost before
Growing season
357 days
frost-free stretch
USDA zone
≈ 10b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Dec 14 Jan 2 Jan 23
First fall frost Jan 14 Dec 25 Dec 4

Computed from NOAA 1991–2020 climate normals at the SAN JOSE 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 San Jose

Computed from San Jose's own frost dates. Click any crop for the full zone-10 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Nov 7 – Nov 21 Jan 9 – Jan 16
🫑 Peppers Oct 24 – Nov 7 Jan 16 – Jan 23
🥬 Lettuce Nov 21 – Dec 5 Dec 5 – Dec 19 Dec 5 – Jan 2
🫛 Peas Nov 21 – Dec 5
🥕 Carrots Dec 12 – Jan 2
🥦 Broccoli Nov 14 – Nov 28 Dec 12 – Dec 26
🥬 Kale Nov 21 – Dec 5 Dec 5 – Dec 19 Dec 5 – Dec 19
🥒 Cucumbers Dec 5 – Dec 12 Jan 9 – Jan 16 Jan 9 – Jan 16
🥒 Zucchini Dec 5 – Dec 12 Jan 9 – Jan 16 Jan 9 – Jan 16
🫘 Green Beans (Bush) Jan 9 – Jan 16
🌽 Sweet Corn Jan 9 – Jan 16
🌿 Basil Nov 21 – Dec 5 Jan 9 – Jan 16 Jan 16 – Jan 23
🧄 Garlic Fall: Nov 13 – Dec 11

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 San Jose's dates automatically after a lookup.

Reading the season in San Jose

With roughly 357 frost-free days, San Jose 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 Dec 25 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in San Jose, CA?

The average last spring frost in San Jose is around Jan 2, 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 San Jose, CA?

The average first fall frost in San Jose arrives around Dec 25. 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 San Jose?

About 357 frost-free days on average, from Jan 2 to Dec 25. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is San Jose in?

USDA zone 10b 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.