Morongo Valley N, CA Frost Dates & Growing Season

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

Last spring frost
Feb 25
~50% chance of frost after
First fall frost
Dec 15
~50% chance of frost before
Growing season
293 days
frost-free stretch
USDA zone
≈ 9a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Jan 7 Feb 25 Apr 3
First fall frost Jan 16 Dec 15 Nov 23
Hard freeze (28°F), median last Jan 25 · first Jan 6

Computed from NOAA 1991–2020 climate normals at the MORONGO VALLEY N 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 Morongo Valley N

Computed from Morongo Valley N'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 31 – Jan 14 Mar 4 – Mar 11
🫑 Peppers Dec 17 – Dec 31 Mar 11 – Mar 18
🥬 Lettuce Jan 14 – Jan 28 Jan 28 – Feb 11 Jan 28 – Feb 25
🫛 Peas Jan 14 – Jan 28
🥕 Carrots Feb 4 – Feb 25
🥦 Broccoli Jan 7 – Jan 21 Feb 4 – Feb 18
🥬 Kale Jan 14 – Jan 28 Jan 28 – Feb 11 Jan 28 – Feb 11
🥒 Cucumbers Jan 28 – Feb 4 Mar 4 – Mar 11 Mar 4 – Mar 11
🥒 Zucchini Jan 28 – Feb 4 Mar 4 – Mar 11 Mar 4 – Mar 11
🫘 Green Beans (Bush) Mar 4 – Mar 11
🌽 Sweet Corn Mar 4 – Mar 11
🌿 Basil Jan 14 – Jan 28 Mar 4 – Mar 11 Mar 11 – Mar 18
🧄 Garlic Fall: Nov 3 – Dec 1

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 Morongo Valley N's dates automatically after a lookup.

Reading the season in Morongo Valley N

With roughly 293 frost-free days, Morongo Valley N 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 15 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Morongo Valley N, CA?

The average last spring frost in Morongo Valley N is around Feb 25, 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 Morongo Valley N, CA?

The average first fall frost in Morongo Valley N arrives around Dec 15. 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 Morongo Valley N?

About 293 frost-free days on average, from Feb 25 to Dec 15. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Morongo Valley N in?

USDA zone 9a 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.