When to plant · 9 cities · zones 5b–7a
When to plant cilantro in Idaho
Direct sow cilantro around Apr 30 — the Idaho statewide median, counted from a last spring frost of May 14 across 253 ZIP codes and 112 NOAA stations.
The rule: Direct sow in 60–70 °F soil, a short row every two weeks from four weeks before the last frost until the heat arrives, then again from late summer.
Idaho cilantro, by step
Statewide median last frost May 14, first fall frost Sep 29, 2027 season. Each cultivar's own indoor lead time and days to maturity, same engine as the Plan Builder.
| Cultivar | Start indoors | Sow | First harvest | Days |
|---|---|---|---|---|
| CilantroSlow Bolt (Coriandrum sativum) | Direct sow | Apr 30 | Jun 14 | 45 from sow |
Tight means first harvest lands within two weeks of the median first fall frost. Statewide dates are the ZIP-weighted median of every NOAA 1991–2020 station Idaho's ZIP codes resolve to; 30 of 283 ZIPs have no datable freeze and are left out.
Cilantro in Idaho, city by city
Cilantro, scheduled from each city's nearest NOAA station — the same dates as its frost page.
| City | Last frost | Sow | First harvest |
|---|---|---|---|
| Boisezone 7a | Apr 24 | Apr 10 | May 25 |
| Meridianzone 7a | Apr 24 | Apr 10 | May 25 |
| Nampazone 7a | Apr 29 | Apr 15 | May 30 |
| Caldwellzone 7a | Apr 29 | Apr 15 | May 30 |
| Idaho Fallszone 5b | May 9 | Apr 25 | Jun 9 |
| Pocatellozone 6a | May 2 | Apr 18 | Jun 2 |
| Coeur d'Alenezone 6b | Apr 22 | Apr 8 | May 23 |
| Twin Fallszone 7a | Apr 25 | Apr 11 | May 26 |
| Post Fallszone 6b | Apr 22 | Apr 8 | May 23 |
What these cilantro become
What Idaho cilantro need
Cilantro / Coriander Seed
Bolts in a heartbeat and there is nothing you can do about it — so you succession-sow instead of fighting it. Non-negotiable in salsa verde and zhoug.
Organic Seed Starter Potting MixMust have
Seed-starting mix is not potting soil with a nicer label — it is finer, lighter, and low in nutrients on purpose, because a seedling's first roots want air and moisture, not fertiliser.
Ocean Forest Potting SoilMust have
Pre-charged with enough nutrition to carry a transplant for its first month without feeding, which is exactly the window when most container plants stall.
5-Gallon Fabric Grow Bags, 5-Pack
Fabric pots air-prune roots and drain faster than a plastic pot can, which is the entire reason container tomatoes fail. Five gallons is the honest minimum for a pepper; a tomato wants ten.
AG-30 Frost Protection Row Cover
AG-30 buys roughly 6 °F of frost protection while passing about 70% of light — enough to carry a crop through an early-October cold snap that would otherwise end your season two weeks short.
6" Micro-Tip Pruning SnipsMust have
Ninety percent of sauce-garden cutting is snipping a pepper stem or a basil node, and a fine-tipped snip does it better than any pruner. Pulling peppers by hand tears the branch.
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Cilantro in Idaho: questions
When should I plant cilantro in Idaho?
Direct sow around Apr 30 at the statewide median; across the state that date runs from Apr 10 in the warmest tenth of Idaho's ZIP codes to May 26 in the coldest. To cut the freeze risk to one year in ten, count from Jun 3 instead of the median last frost. Use the city table for your own town.
When is the last frost in Idaho?
The ZIP-weighted median of NOAA 1991–2020 station medians is May 14. In the warmest tenth of Idaho's ZIP codes the median last frost falls on or before Apr 24; in the coldest tenth, on or after Jun 9.
When will Idaho cilantro be ready to harvest?
Cilantro planted on the statewide date is ready around Jun 14: 45 days from sow.
More for Idaho
- When to plant tomatoes
- When to plant peppers
- When to plant tomatillos
- When to plant basil
- When to plant onions
- When to plant carrots
- When to plant mustard greens
Cilantro in every state → · Idaho frost dates → · How frost-date math works →