Fava Bean (Broad Bean) in Zone 10a & 10b
Vicia faba
Yes, fava bean (broad bean) grows in zones 10a and 10b. Plant it outside Jan 9–Jan 16.
When to plant fava bean (broad bean) in zone 10b
Zones 10a and 10b share the same average frost dates, so this page covers both.
Method: Direct sow: Direct-sow outside. It doesn't transplant well, or doesn't need the extra time indoors.
| Start indoors | Not typically started indoors |
|---|---|
| Direct sow / transplant outside | Jan 9–Jan 16 |
| Estimated harvest | Mar 27–Apr 3 (~77 days after direct-sowing) |
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 2-4 ft.
Plant alongside it in zone 10b
These go outside within two weeks of fava bean (broad bean) in zone 10b, so one planting day can cover them.
- Broccoli Rabe (Raab)Jan 9–Jan 16
- MizunaJan 9–Jan 16
- TatsoiJan 9–Jan 16
- Flower SproutsJan 16–Jan 23
- Gai Lan (Chinese Broccoli)Jan 16–Jan 23
- KalettesJan 16–Jan 23
Fava beans (also called broad beans) look and grow like nothing else in the bean family. Where snap and pole beans want warm soil and hate frost, fava beans want cool weather and go in the ground earliest of any bean you'll grow.
How fava bean (broad bean) fits zone 10's season
Zone 10b's frost-free window runs about 324 days, from January 30 to December 20. Fava bean (broad bean) needs about 77 days from sowing to first harvest.
Fava Bean (Broad Bean) planting windows in every zone
Zone 10b is highlighted. Useful for comparing against a neighbouring zone, or for a garden somewhere else.
| Zone | Start indoors | Sow or plant out | Harvest |
|---|---|---|---|
| 3a & 3b | Not usually | May 9–May 16 | Jul 25–Aug 1 |
| 4a & 4b | Not usually | Apr 24–May 1 | Jul 10–Jul 17 |
| 5a & 5b | Not usually | Apr 19–Apr 26 | Jul 5–Jul 12 |
| 6a & 6b | Not usually | Apr 4–Apr 11 | Jun 20–Jun 27 |
| 7a & 7b | Not usually | Mar 20–Mar 27 | Jun 5–Jun 12 |
| 8a & 8b | Not usually | Mar 4–Mar 11 | May 20–May 27 |
| 9a & 9b | Not usually | Jan 25–Feb 1 | Apr 12–Apr 19 |
| 10a & 10b (your zone) | Not usually | Jan 9–Jan 16 | Mar 27–Apr 3 |
Harvest dates are about 77 days after the sow or plant-out date.
Good companions
- Cabbage: Fixes nitrogen that heavy-feeding cabbage uses, the same mechanism bush beans provide cucumbers. Fava is a cool-season legume, though, so the overlap only works where both are in the ground at once: an overwintered fava or an early spring one, not a summer planting.
Where to buy fava bean seeds
True Leaf Market (each supplier's fava bean seeds)
Varieties we recommend, and where to get them:
- 'Broad Windsor': The old-standard type Vroma is bred to outperform in heat: large buff seeds, a sturdy 4-foot bush, hardy to 12°F. Buy: True Leaf Market Full notes
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing fava bean (broad bean)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 10b calendar · Plan your beds in the Garden Designer →
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Growing Fava Bean (Broad Bean) in USDA zone 10b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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