When to Plant in California

California's vast geography means planting dates vary dramatically — from frost-free coastal zones to mountain areas with short growing seasons. Coastal gardeners can often start warm-season crops earlier than their inland neighbors.

The key to success in California is knowing your microclimate. A gardener in Sacramento faces very different conditions than one in San Francisco, even though they're less than 100 miles apart.

Common Mistakes

Planting warm-season crops too early in Northern California — late frosts in the Central Valley can surprise you into April.
Ignoring microclimates — coastal fog zones stay cooler than inland areas just a few miles away.
Underwatering during dry summers — California's Mediterranean climate means little to no rain from May through October.
Skipping fall planting — California's mild winters are perfect for cool-season crops like lettuce, peas, and broccoli.

FAQ

What is the last frost date?

The last frost date is the typical date in spring when your area has its final frost. After this date, it's generally safe to plant warm-season crops outdoors.

When should I start tomatoes indoors in California?

Start tomato seeds indoors about 6–8 weeks before your last frost date. In most of California, that means starting seeds between late January and mid-March depending on your area.

Can I plant before the last frost?

Yes — cool-season crops like lettuce, peas, spinach, and broccoli can handle light frost and should be planted 4–6 weeks before your last frost date.

Why does timing vary so much within California?

California spans over 700 miles north to south and includes coastal, valley, and mountain regions. Coastal areas are milder, valleys get hotter, and mountain areas have shorter seasons.

What if I live in a frost-free area?

If you're in a frost-free zone like San Diego or parts of the Central Coast, you can plant warm-season crops earlier. Use the app to enter your zip code for exact timing.

How does Plan My Garden create my schedule?

You enter your zip code, and we look up your local frost dates. Then based on the crops you pick, we calculate when to start seeds, transplant, and harvest — personalized to your location.