Cabbage in Zone 6a & 6b
Brassica oleracea
Yes, cabbage grows in zones 6a and 6b. Start seeds indoors Mar 14–Mar 21 and plant out Apr 11–Apr 18. For a fall crop, start seeds indoors Jun 25–Jul 9 and plant out Jul 23–Aug 6.
When to plant cabbage in zone 6b
Zones 6a and 6b share the same average frost dates, so this page covers both.
Method: Start indoors: Start indoors from seed, then transplant outside. It needs a head start most zones can't give it by direct-sowing alone.
| Window | Spring window |
|---|---|
| Start indoors | Mar 14–Mar 21 |
| Direct sow / transplant outside | Apr 11–Apr 18 |
| Estimated harvest | Jun 20–Jun 27 (~70 days after transplanting) |
| Window | Fall window |
|---|---|
| Start indoors | Jun 25–Jul 9 |
| Direct sow / transplant outside | Jul 23–Aug 6 |
| Estimated harvest | Oct 1–Oct 15 (~70 days after transplanting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-1.5 ft.
Fall window: the last sowing date is the average first frost minus days to maturity, the method in Purdue Extension's fall garden guide, which lists cabbage for late-summer planting.
Plant alongside it in zone 6b
These go outside within two weeks of cabbage in zone 6b, so one planting day can cover them.
- RadishMar 28–Apr 4
- CarrotApr 4–Apr 11
- LettuceApr 11–Apr 18
- BroccoliApr 11–Apr 18
- Flower SproutsApr 11–Apr 18
- Gai Lan (Chinese Broccoli)Apr 11–Apr 18
Cabbage takes up a full square foot for months and won't forgive a rushed transplant date. Start it too late into warm weather and it's more likely to bolt or stall than to head up properly.
How cabbage fits zone 6's season
Zone 6b's frost-free window runs about 173 days, from April 25 to October 15. Cabbage needs about 70 days from transplant to first harvest.
Cabbage planting windows in every zone
Zone 6b is highlighted. Useful for comparing against a neighbouring zone, or for a garden somewhere else.
| Zone | Start indoors | Sow or plant out | Harvest |
|---|---|---|---|
| 2a & 2b | Apr 8–Apr 15 | May 6–May 13 | Jul 15–Jul 22 |
| 3a & 3b | Apr 18–Apr 25 | May 16–May 23 | Jul 25–Aug 1 |
| 4a & 4b | Apr 3–Apr 10 | May 1–May 8 | Jul 10–Jul 17 |
| 5a & 5bSpring window | Mar 29–Apr 5 | Apr 26–May 3 | Jul 5–Jul 12 |
| Fall window | Jun 15–Jun 29 | Jul 13–Jul 27 | Sep 21–Oct 5 |
| 6a & 6bSpring window (your zone) | Mar 14–Mar 21 | Apr 11–Apr 18 | Jun 20–Jun 27 |
| Fall window | Jun 25–Jul 9 | Jul 23–Aug 6 | Oct 1–Oct 15 |
| 7a & 7bSpring window | Feb 27–Mar 6 | Mar 27–Apr 3 | Jun 5–Jun 12 |
| Fall window | Jul 5–Jul 19 | Aug 2–Aug 16 | Oct 11–Oct 25 |
| 8a & 8bSpring window | Feb 11–Feb 18 | Mar 11–Mar 18 | May 20–May 27 |
| Fall window | Jul 21–Aug 4 | Aug 18–Sep 1 | Oct 27–Nov 10 |
| 9a & 9bSpring window | Jan 4–Jan 11 | Feb 1–Feb 8 | Apr 12–Apr 19 |
| Fall window | Aug 15–Aug 29 | Sep 12–Sep 26 | Nov 21–Dec 5 |
| 10a & 10bFall window | Aug–Dec | Sep–Jan | ~70 days after transplanting |
Harvest dates are about 70 days after the sow or plant-out date, not after starting seeds indoors.
Zone 2 sows before zone 3 here, which looks wrong and is not. USDA zones rank winter cold, not season length, and zone 2 is mostly interior Alaska, where hard winters come with warm summers. More on what a zone measures.
Good companions
- Onion: Onion scent is reputed to confuse cabbage moths. The research behind this is real but garlic-specific (field trials intercropping garlic with cabbage reduced diamondback moth damage): onion hasn't been tested the same way, so treat the onion version as a reasonable extrapolation, not a directly measured result.
Where to buy cabbage seeds
Botanical Interests · True Leaf Market · Burpee · High Mowing Organic Seeds (each supplier's cabbage seeds)
Varieties we recommend, and where to get them:
- Stonehead or Caraflex (early-season): Iowa State University Extension lists both as early-season varieties (roughly 60-65 days) with good holding ability, suited to gardeners who want a spring crop finished before summer heat or a second planting for fall harvest. Buy: Botanical Interests · High Mowing Organic Seeds Full notes
- 'Golden Acre' (best for small heads, quick turnaround): A 1920s open-pollinated heirloom with solid 5-7 inch heads at just 60 days, smaller and even earlier than Stonehead or Caraflex above. Buy: True Leaf Market · High Mowing Organic Seeds Full notes
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing cabbage" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 6b calendar · Plan your beds in the Garden Designer →
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Growing Cabbage in USDA zone 6b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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