Guajillo Pepper (Mirasol) in Zone 4a & 4b
Capsicum annuum
Yes, guajillo pepper (mirasol) grows in zones 4a and 4b. Start seeds indoors Mar 20–Mar 27 and plant out May 29–Jun 5.
When to plant guajillo pepper (mirasol) 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 | Mar 20–Mar 27 |
|---|---|
| Direct sow / transplant outside | May 29–Jun 5 |
| Estimated harvest | Aug 12–Aug 19 (~75 days after transplanting) |
Spacing: 1 per square foot (square-foot-gardening spacing). Mature height: 1-2 ft.
Plant alongside it in zone 4b
These go outside within two weeks of guajillo pepper (mirasol) 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
Guajillo is the dried form of the mirasol chile, a smooth, tapered pepper that ripens deep red. Dried guajillo is one of the most used chiles in Mexican red sauces and adobos.
How guajillo pepper (mirasol) fits zone 4's season
Zone 4b's frost-free window runs about 128 days, from May 15 to September 20. Guajillo pepper (mirasol) needs about 75 days from transplant to first harvest.
Guajillo Pepper (Mirasol) 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 | Apr 4–Apr 11 | Jun 13–Jun 20 | Aug 27–Sep 3 |
| 4a & 4b (your zone) | Mar 20–Mar 27 | May 29–Jun 5 | Aug 12–Aug 19 |
| 5a & 5b | Mar 15–Mar 22 | May 24–May 31 | Aug 7–Aug 14 |
| 6a & 6b | Feb 28–Mar 7 | May 9–May 16 | Jul 23–Jul 30 |
| 7a & 7b | Feb 13–Feb 20 | Apr 24–May 1 | Jul 8–Jul 15 |
| 8a & 8b | Jan 28–Feb 4 | Apr 8–Apr 15 | Jun 22–Jun 29 |
| 9a & 9b | Dec 21–Dec 28 | Mar 1–Mar 8 | May 15–May 22 |
| 10a & 10bSpring window | Dec–Feb | Feb–Apr | ~75 days after transplanting |
| Summer window | May–Jul | Jul–Sep | ~75 days after transplanting |
| 11a & 11bSummer window | Jun–Dec | Aug–Feb | ~75 days after transplanting |
Harvest dates are about 75 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 guajillo pepper seeds
Botanical Interests (guajillo pepper seeds)
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See it growing
Search YouTube for "growing guajillo pepper (mirasol)" 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 →
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Growing Guajillo Pepper (Mirasol) in USDA zone 4b: when to start seeds indoors, when to direct-sow, and when to expect a harvest.
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