GrowZone

Crop by USDA zone

When to plant watermelon in zone 10a

In USDA zone 10a, plant watermelon around Feb 15, after the representative last frost near Feb 1. Start seeds indoors around Jan 11.

This page summarizes the supported ZIPs in zone 10a. Your exact city can move earlier or later, so use the ZIP lookup for the frost-station-specific answer.

Get exact watermelon dates by ZIP code.

Seed starting schedule

Watermelon dates for Oakland, CA

StepDateHow to use it
Start IndoorsJanuary 11, 2026Start seeds under lights or in a bright indoor seed-starting space.
Transplant OutdoorsFebruary 15, 2026Move hardened-off seedlings outside after the frost-risk window.
Direct SowFebruary 15, 2026Sow seed outside when the crop and soil can handle the window.
Tampa, FL · Zone 10a Watermelon Feb 15 Open ZIP-specific answer · last frost Feb 1 Phoenix, AZ · Zone 10a Watermelon Feb 19 Open ZIP-specific answer · last frost Feb 5 Mesa, AZ · Zone 10a Watermelon Feb 19 Open ZIP-specific answer · last frost Feb 5 San Francisco, CA · Zone 10a Watermelon Feb 8 Open ZIP-specific answer · last frost Jan 25 Oakland, CA · Zone 10a Watermelon Feb 15 Open ZIP-specific answer · last frost Feb 1