Rocoto Pepper in Zone 4a & 4b
Capsicum pubescens
Yes, rocoto pepper grows in zones 4a and 4b. Start seeds indoors Feb 20–Feb 27 and plant out May 29–Jun 5.
When to plant rocoto pepper in zone 4b
Zones 4a and 4b 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 | Feb 20–Feb 27 |
|---|---|
| Direct sow / transplant outside | May 29–Jun 5 |
| Estimated harvest | Sep 26–Oct 3 (~120 days after transplanting) |
Spacing: about 4 square feet per plant (square-foot-gardening spacing). Mature height: 3-4 ft.
Before you plant: Zone 4b's first fall frost usually comes close to or before the harvest. See the details below.
Plant alongside it in zone 4b
These go outside within two weeks of rocoto pepper in zone 4b, so one planting day can cover them.
- Bell PepperMay 29–Jun 5
- 7 Pot Douglah Pepper (Chocolate 7 Pot)May 29–Jun 5
- 7 Pot Primo PepperMay 29–Jun 5
- Aji Amarillo PepperMay 29–Jun 5
- Anaheim Pepper (New Mexico, Hatch)May 29–Jun 5
- Carolina Reaper PepperMay 29–Jun 5
Rocoto is *Capsicum pubescens*, the Andean pepper with fuzzy leaves, purple flowers and black seeds. It behaves differently from every other pepper here: it prefers mild weather and grows into a woody shrub.
How rocoto pepper fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Rocoto pepper needs about 120 days from transplant to first harvest.
Frost risk in zone 4b: Harvest usually starts about 6 days after zone 4b's average first frost (September 20), and rocoto pepper is damaged by even a light frost. It's close: an average date means frost comes earlier about half the time, so pick a faster-maturing variety if you can and be ready to cover plants on cold nights. (Frost tolerance and protection advice: Purdue Extension.)
Rocoto Pepper planting windows in every zone
Zone 4b 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 | Mar 7–Mar 14 | Jun 13–Jun 20 | Oct 11–Oct 18 |
| 4a & 4b (your zone) | Feb 20–Feb 27 | May 29–Jun 5 | Sep 26–Oct 3 |
| 5a & 5b | Feb 15–Feb 22 | May 24–May 31 | Sep 21–Sep 28 |
| 6a & 6b | Jan 31–Feb 7 | May 9–May 16 | Sep 6–Sep 13 |
| 7a & 7b | Jan 16–Jan 23 | Apr 24–May 1 | Aug 22–Aug 29 |
| 8a & 8b | Dec 31–Jan 7 | Apr 8–Apr 15 | Aug 6–Aug 13 |
| 9a & 9b | Nov 23–Nov 30 | Mar 1–Mar 8 | Jun 29–Jul 6 |
| 10a & 10b | Nov 7–Nov 14 | Feb 13–Feb 20 | Jun 13–Jun 20 |
| 11a & 11bSummer window | May–Nov | Aug–Feb | ~120 days after transplanting |
Harvest dates are about 120 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 rocoto pepper seeds
None of the seed suppliers we list carries rocoto pepper seeds right now. A local garden center or a specialty seed house is the place to look.
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 rocoto pepper" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
← Back to the full zone 4b calendar · Plan your beds in the Garden Designer →
Pin this for later
Growing Rocoto Pepper in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
Save to Pinterest