When to plant summer squash / zucchini in San Francisco
Summer squash / Zucchini is frost-tender, so every date keys off San Francisco's last spring frost.
Step 1 · Sow
Direct sow outdoors
Jul 6 – Jul 27
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Aug 20 – Sep 4
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
From sowing to first pick.
Common questions
When can I sow summer squash / zucchini outdoors in San Francisco?
Direct-sow around early July (Jul 6–Jul 27) in San Francisco, based on its local frost dates. Confidence 81%.
When will summer squash / zucchini be ready to harvest in San Francisco?
Expect to harvest from around mid August (Aug 20–Sep 4) in San Francisco, based on its local frost dates. Confidence 76%.
How long is the growing season in San Francisco?
San Francisco has roughly 365 frost-free days, which is enough time to grow summer squash / zucchini to maturity outdoors.
The rule of thumb
Sow summer squash / zucchini 6–8 weeks before your last spring frost; plant out 2–3 weeks after it. Every date on this page is derived from that rule and San Francisco's frost dates.
Confidence 84/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.