What Grows in Altadena, CA?

Altadena, CA is in USDA Hardiness Zone 10b. This drives everything about what you can reliably grow — it maps directly to how cold your winters get.

The average last spring frost in Altadena is around virtually frost-free, and the first fall frost is typically virtually frost-free. Plan to move tender plants outside after virtually frost-free and have them harvested (or protected) before virtually frost-free.

Plenty — Altadena's USDA Zone 10b climate supports 30+ crops. Some of the easiest and most reliable here are Cherry Tomato, Chili Pepper, Cucumber.

Altadena typically has around 345 frost-free days per year (roughly virtually frost-free to virtually frost-free). That's a full season — plenty of time for most annual vegetables plus a succession or fall crop of cool-season greens.

Go with fast-maturing crops to get a quick win while the season is short: Microgreens, Basil, Mustard Greens are among the quickest from seed to harvest in Altadena.

Yes — Altadena's climate is container-friendly for the right crops. Tomato, Cherry Tomato, Bell Pepper all do well in pots, which also lets you start them a little earlier and move them in on cold nights.

For warm-season crops like Tomato, Cherry Tomato, Bell Pepper, start seeds indoors 6–8 weeks before your last frost (around virtually frost-free), then transplant after the danger of frost has passed.