Imperial, CA Frost Dates & Growing Season

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

Last spring frost
Jan 4
~50% chance of frost after
First fall frost
Dec 26
~50% chance of frost before
Growing season
356 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 13 Jan 4 Feb 7
First fall frost Jan 25 Dec 26 Dec 6
Hard freeze (28°F), median last Jan 4 · first Jan 1

Computed from NOAA 1991–2020 climate normals at the IMPERIAL 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 Imperial

Computed from Imperial'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 9 – Nov 23 Jan 11 – Jan 18
🫑 Peppers Oct 26 – Nov 9 Jan 18 – Jan 25
🥬 Lettuce Nov 23 – Dec 7 Dec 7 – Dec 21 Dec 7 – Jan 4
🫛 Peas Nov 23 – Dec 7
🥕 Carrots Dec 14 – Jan 4
🥦 Broccoli Nov 16 – Nov 30 Dec 14 – Dec 28
🥬 Kale Nov 23 – Dec 7 Dec 7 – Dec 21 Dec 7 – Dec 21
🥒 Cucumbers Dec 7 – Dec 14 Jan 11 – Jan 18 Jan 11 – Jan 18
🥒 Zucchini Dec 7 – Dec 14 Jan 11 – Jan 18 Jan 11 – Jan 18
🫘 Green Beans (Bush) Jan 11 – Jan 18
🌽 Sweet Corn Jan 11 – Jan 18
🌿 Basil Nov 23 – Dec 7 Jan 11 – Jan 18 Jan 18 – Jan 25
🧄 Garlic Fall: Nov 14 – Dec 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 Imperial's dates automatically after a lookup.

Reading the season in Imperial

With roughly 356 frost-free days, Imperial 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 26 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Imperial, CA?

The average last spring frost in Imperial is around Jan 4, 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 Imperial, CA?

The average first fall frost in Imperial arrives around Dec 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 Imperial?

About 356 frost-free days on average, from Jan 4 to Dec 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 Imperial 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.