Thai Chili Pepper (Bird's Eye) in Zone 5a & 5b
Capsicum annuum
Yes, Thai chili pepper (bird's eye) grows in zones 5a and 5b. Start seeds indoors Mar 15–Mar 22 and plant out May 24–May 31.
When to plant Thai chili pepper (bird's eye) 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 15–Mar 22 |
|---|---|
| Direct sow / transplant outside | May 24–May 31 |
| Estimated harvest | Aug 12–Aug 19 (~80 days after transplanting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1.5-3 ft.
Plant alongside it in zone 5b
These go outside within two weeks of Thai chili pepper (bird's eye) in zone 5b, so one planting day can cover them.
- Bell PepperMay 24–May 31
- 7 Pot Douglah Pepper (Chocolate 7 Pot)May 24–May 31
- 7 Pot Primo PepperMay 24–May 31
- Aji Amarillo PepperMay 24–May 31
- Anaheim Pepper (New Mexico, Hatch)May 24–May 31
- Carolina Reaper PepperMay 24–May 31
Thai chilies, also called bird's eye chilies, are small, pointed and very hot. Baker Creek says this type is used in almost every Thai dish, and the fruit dries easily.
How Thai chili pepper (bird's eye) fits zone 5's season
Zone 5b's frost-free window runs about 148 days, from May 10 to October 5. Thai chili pepper (bird's eye) needs about 80 days from transplant to first harvest.
Thai Chili Pepper (Bird's Eye) 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 4–Apr 11 | Jun 13–Jun 20 | Sep 1–Sep 8 |
| 4a & 4b | Mar 20–Mar 27 | May 29–Jun 5 | Aug 17–Aug 24 |
| 5a & 5b (your zone) | Mar 15–Mar 22 | May 24–May 31 | Aug 12–Aug 19 |
| 6a & 6b | Feb 28–Mar 7 | May 9–May 16 | Jul 28–Aug 4 |
| 7a & 7b | Feb 13–Feb 20 | Apr 24–May 1 | Jul 13–Jul 20 |
| 8a & 8b | Jan 28–Feb 4 | Apr 8–Apr 15 | Jun 27–Jul 4 |
| 9a & 9b | Dec 21–Dec 28 | Mar 1–Mar 8 | May 20–May 27 |
| 10a & 10bSpring window | Dec–Feb | Feb–Apr | ~80 days after transplanting |
| Summer window | May–Jul | Jul–Sep | ~80 days after transplanting |
| 11a & 11bSummer window | Jun–Dec | Aug–Feb | ~80 days after transplanting |
Harvest dates are about 80 days after the sow or plant-out date, not after starting seeds indoors.
Good companions
- Basil: Reputed to repel aphids and improve pepper growth nearby, but a controlled garden trial testing this same claim on a related crop found no pest-reduction benefit from basil, and found higher pest counts on the basil-companioned plants. Treat this pairing as unproven, not as a working pest deterrent.
- Onion: Reputed to deter many common pepper pests, though this specific pairing hasn't been tested the way onion/carrot pest-masking has. Treat it as garden tradition.
Where to buy Thai chili pepper seeds
Botanical Interests · True Leaf Market · Burpee (Thai chili pepper seeds)
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing Thai chili pepper (bird's eye)" 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 Thai Chili Pepper (Bird's Eye) in USDA zone 5b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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