Zone 9b planting calendar

What to plant in September: zone 9b

A rule-of-thumb starting point for zone 9b: last spring frost around February 15, first fall frost around December 15. 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: February 15

Typical first frost: December 15

Winter lows: 25 to 30 °F

Zone 9b Almanac. What growers here actually recorded: sowing weeks, days to first pick, and yields.

Start indoors for fall

Kalearound Sep 6
Fall kale window opens. Sow trays any time in the next four weeks.
Broccoliaround Sep 17
Seedlings need 5 weeks before they go out for a fall harvest.

Direct sow for fall

Parsleyaround Sep 8
Fall parsley window opens. Sowing now beats the last-minute date by a month of growth.
Bush beanaround Sep 13
Fall bush bean window opens. Sowing now beats the last-minute date by a month of growth.
Lettucearound Sep 14
Succession sowing 3 of 3. Sow every 21 days for a steady cut.
Peaaround Sep 18
Fall pea window opens. Sowing now beats the last-minute date by a month of growth.
Cilantroaround Sep 19
Succession sowing 3 of 3. Sow every 21 days for a steady cut.
Carrotaround Sep 19
Fall carrot window opens. Sowing now beats the last-minute date by a month of growth.
Beetaround Sep 23
Fall beet window opens. Sowing now beats the last-minute date by a month of growth.
Dillaround Sep 23
Fall dill window opens. Sowing now beats the last-minute date by a month of growth.

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