Zone 10a Planting Calendar

What to do

Find your region in the table before you use any date. These are planting bands — when to sow or set out — not the full months a crop can live in the bed. A tomato planted by July 15 on the South Coast may keep producing into September; that in-ground stretch is longer than the sow window. Direct-sow carrots, lettuce, and spinach; set out broccoli, cabbage, onions, tomatoes, and peppers as transplants.

Region	Crops	Planting window
Coastal Southern California, cool-season	broccoli, cabbage, carrots, lettuce, spinach, onions	Jun–Jul and Jan–Feb (broccoli); Aug–Feb (cabbage); Jan–Sep (carrots); Aug–Apr (lettuce); Aug–Mar (spinach); Feb–Oct (onions)
Coastal Southern California, warm-season	tomatoes, peppers, eggplant, corn, cucumbers, summer squash	Apr 1 – Jul 15 (tomatoes); Apr–May (peppers, eggplant); Mar–Jul (corn); Apr–Jun (cucumbers, summer squash)
South Florida, cool-season	broccoli, cabbage, carrots, lettuce, spinach, onions	Oct 1 – Jan 31
South Florida, main window	tomatoes, peppers	Aug–Feb (Aug–Dec tomatoes limited to larger-fruited, heat-tolerant varieties)
South Florida, June	cassava, chayote, cherry tomatoes, Chinese yams, malanga, pigeon peas, pumpkin, sweet potatoes	Jun, eight heat-tolerant and vining crops only
South Florida, July	cassava, chayote, malanga, summer squash, yard-long beans	Jul, five crops only

March through May on the South Florida side is thin rather than empty: beans, peas, and watermelon still go in then, but tomatoes and peppers wait until August. June and July stay those eight and five crops; cassava, malanga, and Chinese yams are starchy tropical roots, chayote is a vining squash, and pigeon peas and yard-long beans are heat-tolerant legumes.

The July 15 warm-band cutoff on the South Coast is also a variety decision: count days-to-maturity backward from it and favor faster, heat-setting types. South Florida’s August-through-December limit to larger-fruited, heat-tolerant tomatoes is the same call. Both are covered in growing tomatoes. Tomatoes carry a heat ceiling wherever they grow — day and night temperatures around 95°F and 80°F cut pollen viability, and three or more hours at 103°F on consecutive days can fail fruit set outright.

Arbor schedules zone 10a planting tasks against these short bands on a coastal Southern California calendar — cool crops in the August-through-October and January-through-February windows, warm crops April through July 15 — not a year-round warm season.

Zone and season notes

10a splits by region more than the half-zone label suggests. Inland Southern California gets an occasional light frost most winters, with a one-in-ten chance as late as March 7. That tail still sits ahead of the April warm-band start, so spring frost is not what blocks inland warm-season planting. Do not apply the coastal July 15 tomato cutoff inland. For the January–February cool band, time those sowings around your own last freeze that week rather than treating those coastal bars as a guarantee. Coastal Southern California runs close to frost-free almost every year. South Florida’s 10a portion runs frost-free in most years, with summer heat and humidity doing the constraining: eight plantable crops in June and five in July rather than a season that shuts down. Higher elevation inside 10a runs later and cooler than the stations named; use your own last freeze and heat pattern rather than the table as exact if you garden in the foothills.

“Zone 10 has one long growing season, plant whenever” is wrong in both geographies. Coastal Southern California has a real warm-band cutoff at July 15 for tomatoes, and South Florida’s midsummer lists run short rather than full. 10a differs from zone 10b mainly in frost: 10b has none at all, while 10a keeps a nominal window because Riverside, inland, sees a light freeze most years — the same cool-season/warm-season split, anchored on heat.

Coastal Texas has no dated row in this calendar. Texas A&M’s statewide guide keys planting to frost-free and first-freeze dates rather than publishing a coastal table. That frost-keyed method is a different calendar than the heat-band dates above; do not use the South Coast row. Work from your own two dates and the wave math in when to plant vegetables if you garden there.