When to plant radish in San Francisco
Radish is cold-hardy, so every date keys off San Francisco's frost dates.
Step 1 · Sow
Direct sow outdoors
Dec 20 – Jan 10
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Jan 14 – Jan 19
Picking runs until conditions turn against the crop.
Window
Days to maturity
25 – 30 d
From sowing to first pick.
Common questions
When can I sow radish outdoors in San Francisco?
Direct-sow around mid December (Dec 20–Jan 10) in San Francisco, based on its local frost dates. Confidence 81%.
When will radish be ready to harvest in San Francisco?
Expect to harvest from around mid January (Jan 14–Jan 19) 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 radish to maturity outdoors.
The rule of thumb
Sow radish as soon as the soil is workable — it tolerates cool weather and light frost. 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.