Zone 10a planting calendar

What to plant in August: zone 10a

A rule-of-thumb starting point for zone 10a: last spring frost around January 30, first fall frost around December 25. Zones are set by winter lows, not frost dates, so two gardens in the same zone can be weeks apart. Measure your ZIP below for dates from your area's own 30-year record.

These are zone-average dates. Check an area-level frost estimate from thirty years of nearby weather history and this calendar retimes itself.
Typical last frost: January 30
Typical first frost: December 25
Winter lows: 30 to 35 °F
Zone 10a Almanac. What growers here actually recorded: sowing weeks, days to first pick, and yields.

Plan & order

  • Order fall seedaround Aug 27

    Fall brassicas and greens get sown in the heat of summer. Have the seed on hand before that window opens.

Start indoors for fall

  • Broccoliaround Aug 30

    Fall broccoli window opens. Sow trays any time in the next four weeks.

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