Superhot Pepper (Ghost, Reaper, Scorpion) in Zone 4a & 4b
Capsicum chinense
Superhot pepper (Ghost, Reaper, Scorpion) can grow in zones 4a and 4b, but its usual harvest starts after the average first frost, so it takes an early variety and frost protection. Start seeds indoors Feb 27–Mar 6 and plant out May 29–Jun 5.
When to plant superhot pepper (Ghost, Reaper, Scorpion) 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 | Oct 11–Oct 18 (~135 days after transplanting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 2-3 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 superhot pepper (Ghost, Reaper, Scorpion) 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
Superhot peppers (Ghost, Reaper, Scorpion, and their relatives) are a different commitment than a standard pepper plant. Days to maturity commonly runs 120-150+ days versus roughly 75-100 for a regular hot pepper, and germination itself is slower and far less consistent, sometimes taking 2-6 weeks instead of the usual week or so. Start these far earlier than you'd think to.
How superhot pepper (Ghost, Reaper, Scorpion) fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Superhot pepper (Ghost, Reaper, Scorpion) needs about 135 days from transplant to first harvest.
Frost risk in zone 4b: Harvest usually starts about 21 days after zone 4b's average first frost (September 20), and superhot pepper (Ghost, Reaper, Scorpion) is damaged by even a light frost. Expect frost to arrive first in most years unless you choose the fastest-maturing variety you can find, start it as early as the dates above allow, and cover plants on cold nights. (Frost tolerance and protection advice: Purdue Extension.)
Superhot Pepper (Ghost, Reaper, Scorpion) 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 26–Nov 2 |
| 4a & 4b (your zone) | Feb 27–Mar 6 | May 29–Jun 5 | Oct 11–Oct 18 |
| 5a & 5b | Feb 22–Mar 1 | May 24–May 31 | Oct 6–Oct 13 |
| 6a & 6b | Feb 7–Feb 14 | May 9–May 16 | Sep 21–Sep 28 |
| 7a & 7b | Jan 23–Jan 30 | Apr 24–May 1 | Sep 6–Sep 13 |
| 8a & 8b | Jan 7–Jan 14 | Apr 8–Apr 15 | Aug 21–Aug 28 |
| 9a & 9b | Nov 30–Dec 7 | Mar 1–Mar 8 | Jul 14–Jul 21 |
| 10a & 10bSummer window | May–Jul | Aug–Sep | ~135 days after transplanting |
| 11a & 11bSummer window | May–Nov | Aug–Feb | ~135 days after transplanting |
Harvest dates are about 135 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 superhot pepper seeds
Varieties we recommend, and where to get them:
- Bhut Jolokia (Ghost Pepper): The variety that started the modern superhot craze, rated just over 1 million Scoville units by Sandia Seed, at 110 days from transplant, squarely in the standard 120-150+ day range Reaper and Trinidad Scorpion Yellow are both faster than. Buy: Botanical Interests · True Leaf Market Full notes
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See it growing
Search YouTube for "growing superhot pepper (Ghost, Reaper, Scorpion)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Superhot Pepper (Ghost, Reaper, Scorpion) in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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