Hearst Castle, CA Frost Dates & Growing Season

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

Last spring frost
Feb 13
~50% chance of frost after
First fall frost
Feb 1
~50% chance of frost before
Growing season
353 days
frost-free stretch
USDA zone
≈ 9b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Dec 29 Feb 13 Mar 31
First fall frost Mar 20 Feb 1 Dec 16

Computed from NOAA 1991–2020 climate normals at the HEARST CASTLE 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 Hearst Castle

Computed from Hearst Castle'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 19 – Jan 2 Feb 20 – Feb 27
🫑 Peppers Dec 5 – Dec 19 Feb 27 – Mar 6
🥬 Lettuce Jan 2 – Jan 16 Jan 16 – Jan 30 Jan 16 – Feb 13
🫛 Peas Jan 2 – Jan 16
🥕 Carrots Jan 23 – Feb 13
🥦 Broccoli Dec 26 – Jan 9 Jan 23 – Feb 6
🥬 Kale Jan 2 – Jan 16 Jan 16 – Jan 30 Jan 16 – Jan 30
🥒 Cucumbers Jan 16 – Jan 23 Feb 20 – Feb 27 Feb 20 – Feb 27
🥒 Zucchini Jan 16 – Jan 23 Feb 20 – Feb 27 Feb 20 – Feb 27
🫘 Green Beans (Bush) Feb 20 – Feb 27
🌽 Sweet Corn Feb 20 – Feb 27
🌿 Basil Jan 2 – Jan 16 Feb 20 – Feb 27 Feb 27 – Mar 6
🧄 Garlic Fall: Dec 21 – Jan 18

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 Hearst Castle's dates automatically after a lookup.

Reading the season in Hearst Castle

With roughly 353 frost-free days, Hearst Castle 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 Feb 1 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Hearst Castle, CA?

The average last spring frost in Hearst Castle is around Feb 13, 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 Hearst Castle, CA?

The average first fall frost in Hearst Castle arrives around Feb 1. 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 Hearst Castle?

About 353 frost-free days on average, from Feb 13 to Feb 1. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Hearst Castle 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.