Glennville, CA Frost Dates & Growing Season

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

Last spring frost
May 11
~50% chance of frost after
First fall frost
Oct 17
~50% chance of frost before
Growing season
159 days
frost-free stretch
USDA zone
≈ 9b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Apr 21 May 11 Jun 6
First fall frost Nov 4 Oct 17 Sep 30
Hard freeze (28°F), median last Apr 19 · first Nov 2

Computed from NOAA 1991–2020 climate normals at the GLENNVILLE 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 Glennville

Computed from Glennville'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 Mar 16 – Mar 30 May 18 – May 25
🫑 Peppers Mar 2 – Mar 16 May 25 – Jun 1
🥬 Lettuce Mar 30 – Apr 13 Apr 13 – Apr 27 Apr 13 – May 11
🫛 Peas Mar 30 – Apr 13
🥕 Carrots Apr 20 – May 11
🥦 Broccoli Mar 23 – Apr 6 Apr 20 – May 4
🥬 Kale Mar 30 – Apr 13 Apr 13 – Apr 27 Apr 13 – Apr 27
🥒 Cucumbers Apr 13 – Apr 20 May 18 – May 25 May 18 – May 25
🥒 Zucchini Apr 13 – Apr 20 May 18 – May 25 May 18 – May 25
🫘 Green Beans (Bush) May 18 – May 25
🌽 Sweet Corn May 18 – May 25
🌿 Basil Mar 30 – Apr 13 May 18 – May 25 May 25 – Jun 1
🧄 Garlic Fall: Sep 5 – Oct 3

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 Glennville's dates automatically after a lookup.

Reading the season in Glennville

Roughly 159 frost-free days gives Glennville gardeners room for nearly every common vegetable. Warm-season crops go out after May 11; a fall garden sown in late summer matures comfortably before the Oct 17 frost.

Frequently asked questions

When is the last frost in Glennville, CA?

The average last spring frost in Glennville is around May 11, 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 Glennville, CA?

The average first fall frost in Glennville arrives around Oct 17. 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 Glennville?

About 159 frost-free days on average, from May 11 to Oct 17. That fits nearly all common vegetables, though the longest-season melons and sweet potatoes benefit from transplants.

What USDA zone is Glennville 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.