Martinez Wtp, CA Frost Dates & Growing Season

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

Last spring frost
Feb 28
~50% chance of frost after
First fall frost
Nov 22
~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 29 Feb 28 Apr 5
First fall frost Dec 10 Nov 22 Nov 7
Hard freeze (28°F), median last Jan 23 · first Dec 9

Computed from NOAA 1991–2020 climate normals at the MARTINEZ WTP 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 Martinez Wtp

Computed from Martinez Wtp'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 3 – Jan 17 Mar 7 – Mar 14
🫑 Peppers Dec 20 – Jan 3 Mar 14 – Mar 21
🥬 Lettuce Jan 17 – Jan 31 Jan 31 – Feb 14 Jan 31 – Feb 28
🫛 Peas Jan 17 – Jan 31
🥕 Carrots Feb 7 – Feb 28
🥦 Broccoli Jan 10 – Jan 24 Feb 7 – Feb 21
🥬 Kale Jan 17 – Jan 31 Jan 31 – Feb 14 Jan 31 – Feb 14
🥒 Cucumbers Jan 31 – Feb 7 Mar 7 – Mar 14 Mar 7 – Mar 14
🥒 Zucchini Jan 31 – Feb 7 Mar 7 – Mar 14 Mar 7 – Mar 14
🫘 Green Beans (Bush) Mar 7 – Mar 14
🌽 Sweet Corn Mar 7 – Mar 14
🌿 Basil Jan 17 – Jan 31 Mar 7 – Mar 14 Mar 14 – Mar 21
🧄 Garlic Fall: Oct 11 – Nov 8

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 Martinez Wtp's dates automatically after a lookup.

Reading the season in Martinez Wtp

With roughly 267 frost-free days, Martinez Wtp 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 22 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Martinez Wtp, CA?

The average last spring frost in Martinez Wtp is around Feb 28, 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 Martinez Wtp, CA?

The average first fall frost in Martinez Wtp arrives around Nov 22. 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 Martinez Wtp?

About 267 frost-free days on average, from Feb 28 to Nov 22. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Martinez Wtp 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.