Carolina Reaper Pepper in Zone 4a & 4b
Capsicum chinense
Yes, Carolina Reaper pepper grows in zones 4a and 4b. Start seeds indoors Feb 27–Mar 6 and plant out May 29–Jun 5.
When to plant Carolina Reaper 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 27–Mar 6 |
|---|---|
| Direct sow / transplant outside | May 29–Jun 5 |
| Estimated harvest | Sep 21–Sep 28 (~115 days after transplanting) |
Spacing: about 4 square feet per plant (square-foot-gardening spacing). Mature height: 4-5 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 Carolina Reaper 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
- Cayenne PepperMay 29–Jun 5
Carolina Reaper is the red, wrinkled superhot with a pointed tail, bred in South Carolina by Ed Currie of PuckerButt Pepper Company. It once held the Guinness record for the hottest pepper, at 1.64 million Scoville units.
How Carolina Reaper pepper fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Carolina Reaper pepper needs about 115 days from transplant to first harvest.
Frost risk in zone 4b: Harvest usually starts about 1 day after zone 4b's average first frost (September 20), and Carolina Reaper 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.)
Carolina Reaper 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 14–Mar 21 | Jun 13–Jun 20 | Oct 6–Oct 13 |
| 4a & 4b (your zone) | Feb 27–Mar 6 | May 29–Jun 5 | Sep 21–Sep 28 |
| 5a & 5b | Feb 22–Mar 1 | May 24–May 31 | Sep 16–Sep 23 |
| 6a & 6b | Feb 7–Feb 14 | May 9–May 16 | Sep 1–Sep 8 |
| 7a & 7b | Jan 23–Jan 30 | Apr 24–May 1 | Aug 17–Aug 24 |
| 8a & 8b | Jan 7–Jan 14 | Apr 8–Apr 15 | Aug 1–Aug 8 |
| 9a & 9b | Nov 30–Dec 7 | Mar 1–Mar 8 | Jun 24–Jul 1 |
| 10a & 10bSummer window | May–Jul | Aug–Sep | ~115 days after transplanting |
| 11a & 11bSummer window | May–Nov | Aug–Feb | ~115 days after transplanting |
Harvest dates are about 115 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 Carolina Reaper pepper seeds
None of the seed suppliers we list carries Carolina Reaper pepper seeds right now. A local garden center or a specialty seed house is the place to look.
See why we recommend these suppliers →
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See it growing
Search YouTube for "growing Carolina Reaper pepper" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Carolina Reaper Pepper in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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