Jalapeño Pepper in Zone 3a & 3b
Capsicum annuum
Yes, jalapeño pepper grows in zones 3a and 3b. Start seeds indoors Apr 4–Apr 11 and plant out Jun 13–Jun 20.
When to plant jalapeño pepper in zone 3b
Zones 3a and 3b 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 | Apr 4–Apr 11 |
|---|---|
| Direct sow / transplant outside | Jun 13–Jun 20 |
| Estimated harvest | Aug 24–Aug 31 (~72 days after transplanting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 2-3 ft.
Plant alongside it in zone 3b
These go outside within two weeks of jalapeño pepper in zone 3b, so one planting day can cover them.
- Bell PepperJun 13–Jun 20
- 7 Pot Douglah Pepper (Chocolate 7 Pot)Jun 13–Jun 20
- 7 Pot Primo PepperJun 13–Jun 20
- Aji Amarillo PepperJun 13–Jun 20
- Anaheim Pepper (New Mexico, Hatch)Jun 13–Jun 20
- Carolina Reaper PepperJun 13–Jun 20
Jalapeño is the hot pepper most gardeners grow first. Smoked and dried at the red stage, it becomes chipotle.
How jalapeño pepper fits zone 3's season
Zone 3b's frost-free window runs about 98 days, from May 30 to September 5. Jalapeño pepper needs about 72 days from transplant to first harvest.
Jalapeño Pepper planting windows in every zone
Zone 3b 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 (your zone) | Apr 4–Apr 11 | Jun 13–Jun 20 | Aug 24–Aug 31 |
| 4a & 4b | Mar 20–Mar 27 | May 29–Jun 5 | Aug 9–Aug 16 |
| 5a & 5b | Mar 15–Mar 22 | May 24–May 31 | Aug 4–Aug 11 |
| 6a & 6b | Feb 28–Mar 7 | May 9–May 16 | Jul 20–Jul 27 |
| 7a & 7b | Feb 13–Feb 20 | Apr 24–May 1 | Jul 5–Jul 12 |
| 8a & 8b | Jan 28–Feb 4 | Apr 8–Apr 15 | Jun 19–Jun 26 |
| 9a & 9b | Dec 21–Dec 28 | Mar 1–Mar 8 | May 12–May 19 |
| 10a & 10bSpring window | Dec–Feb | Feb–Apr | ~72 days after transplanting |
| Summer window | May–Jul | Jul–Sep | ~72 days after transplanting |
| 11a & 11bSummer window | Jun–Dec | Aug–Feb | ~72 days after transplanting |
Harvest dates are about 72 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 jalapeño pepper seeds
Botanical Interests · True Leaf Market · Burpee · High Mowing Organic Seeds (each supplier's jalapeño pepper seeds)
See why we recommend these suppliers →
As an Amazon Associate we earn from qualifying purchases. Some links on this page also go to other retailers we may earn a commission from as an affiliate, at no extra cost to you. We only recommend products with a clear consensus of positive, independent reviews, or ones we bought and use ourselves. Each item on our gear page says which.
See it growing
Search YouTube for "growing jalapeño pepper" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 3b calendar · Plan your beds in the Garden Designer →
Pin this for later
Growing Jalapeño Pepper in USDA zone 3b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
Save to Pinterest