Three Rivers Edison Ph 1, CA Frost Dates & Growing Season

The two dates every Three Rivers Edison Ph 1 garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Mar 16
~50% chance of frost after
First fall frost
Nov 26
~50% chance of frost before
Growing season
255 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 5 Mar 16 Apr 14
First fall frost Dec 12 Nov 26 Nov 5
Hard freeze (28°F), median last Jan 30 · first Dec 11

Computed from NOAA 1991–2020 climate normals at the THREE RIVERS EDISON PH 1 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 Three Rivers Edison Ph 1

Computed from Three Rivers Edison Ph 1'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 19 – Feb 2 Mar 23 – Mar 30
🫑 Peppers Jan 5 – Jan 19 Mar 30 – Apr 6
🥬 Lettuce Feb 2 – Feb 16 Feb 16 – Mar 2 Feb 16 – Mar 16
🫛 Peas Feb 2 – Feb 16
🥕 Carrots Feb 23 – Mar 16
🥦 Broccoli Jan 26 – Feb 9 Feb 23 – Mar 9
🥬 Kale Feb 2 – Feb 16 Feb 16 – Mar 2 Feb 16 – Mar 2
🥒 Cucumbers Feb 16 – Feb 23 Mar 23 – Mar 30 Mar 23 – Mar 30
🥒 Zucchini Feb 16 – Feb 23 Mar 23 – Mar 30 Mar 23 – Mar 30
🫘 Green Beans (Bush) Mar 23 – Mar 30
🌽 Sweet Corn Mar 23 – Mar 30
🌿 Basil Feb 2 – Feb 16 Mar 23 – Mar 30 Mar 30 – Apr 6
🧄 Garlic Fall: Oct 15 – Nov 12

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 Three Rivers Edison Ph 1's dates automatically after a lookup.

Reading the season in Three Rivers Edison Ph 1

With roughly 255 frost-free days, Three Rivers Edison Ph 1 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 26 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Three Rivers Edison Ph 1, CA?

The average last spring frost in Three Rivers Edison Ph 1 is around Mar 16, 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 Three Rivers Edison Ph 1, CA?

The average first fall frost in Three Rivers Edison Ph 1 arrives around Nov 26. 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 Three Rivers Edison Ph 1?

About 255 frost-free days on average, from Mar 16 to Nov 26. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Three Rivers Edison Ph 1 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.