Basil in Zone 5a & 5b
Ocimum basilicum
Yes, basil grows in zones 5a and 5b. Start seeds indoors Mar 29–Apr 5 and plant out May 24–May 31.
When to plant basil in zone 5b
Zones 5a and 5b 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.
| Start indoors | Mar 29–Apr 5 |
|---|---|
| Direct sow / transplant outside | May 24–May 31 |
| Estimated harvest | Jul 23–Jul 30 (~60 days after transplanting) |
Spacing: 4 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
Plant alongside it in zone 5b
These go outside within two weeks of basil in zone 5b, so one planting day can cover them.
- RosemaryMay 24–May 31
- BorageMay 10–May 17
- SageMay 24–May 31
- TobaccoMay 24–May 31
- Za'atar OreganoMay 24–May 31
- CatmintMay 17–May 24
Basil is arguably the best value crop in a home garden: a single plant produces far more than the tiny, expensive plastic clamshells at the grocery store, and fresh-cut basil's flavor fades within days of harvest, so growing your own is a genuine upgrade over what a grocery-store clamshell gets you, well beyond the money saved.
How basil fits zone 5's season
Zone 5b's frost-free window runs about 148 days, from May 10 to October 5. Basil needs about 60 days from transplant to first harvest.
Basil planting windows in every zone
Zone 5b 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 | Apr 18–Apr 25 | Jun 13–Jun 20 | Aug 12–Aug 19 |
| 4a & 4b | Apr 3–Apr 10 | May 29–Jun 5 | Jul 28–Aug 4 |
| 5a & 5b (your zone) | Mar 29–Apr 5 | May 24–May 31 | Jul 23–Jul 30 |
| 6a & 6b | Mar 14–Mar 21 | May 9–May 16 | Jul 8–Jul 15 |
| 7a & 7b | Feb 27–Mar 6 | Apr 24–May 1 | Jun 23–Jun 30 |
| 8a & 8b | Feb 11–Feb 18 | Apr 8–Apr 15 | Jun 7–Jun 14 |
| 9a & 9b | Jan 4–Jan 11 | Mar 1–Mar 8 | Apr 30–May 7 |
| 10a & 10bSpring window | Jan–Jul | Feb–Aug | ~60 days after transplanting |
| 11a & 11b | Nov 20–Nov 27 | Jan 15–Jan 22 | Mar 16–Mar 23 |
Harvest dates are about 60 days after the sow or plant-out date, not after starting seeds indoors.
Good companions
- Tomato: Reputed to improve tomato flavor and repel pests, but a multi-year, garden-scale controlled trial found no consistent taste preference in blind tests, and no pest-reduction benefit: treat this as one of companion planting's least-supported popular claims.
- Bell Pepper: Reputed to repel aphids and improve growth nearby, but the same controlled trial that tested basil's tomato pairing found no pest-reduction benefit on a related crop, and even higher pest counts in one case: treat this as unproven.
Where to buy basil seeds
Botanical Interests · True Leaf Market · Burpee · High Mowing Organic Seeds (each supplier's basil seeds)
Varieties we recommend, and where to get them:
- Rutgers Devotion DMR: One of the first Rutgers-bred downy mildew resistant releases. Buy: High Mowing Organic Seeds Full notes
- 'Genovese' (best for classic pesto flavor): Johnny's describes large, 3-inch dark green leaves with authentic Italian flavor on a tall, relatively slow-to-bolt plant, the standard culinary type all three disease-resistant varieties above are ultimately bred to match in flavor. Buy: Botanical Interests · True Leaf Market · Burpee · High Mowing Organic Seeds Full notes
- Sweet Thai (best for Asian cooking, ornamental stems): Johnny's lists purple stems and blooms against green leaves, with a spicy anise-clove flavor entirely different from Genovese's sweet Italian profile, at 64 days. Buy: Botanical Interests · High Mowing Organic Seeds Full notes
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing basil" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 5b calendar · Plan your beds in the Garden Designer →
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Growing Basil in USDA zone 5b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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