When to plant · 9 cities · zones 5b–7a
When to plant tomatillos in Idaho
Start Tomatillo seeds indoors around Apr 2 and transplant around May 21 — the Idaho statewide median, counted from a last spring frost of May 14 across 253 ZIP codes and 112 NOAA stations.
The rule: Six weeks indoors, transplant after the last frost, and give each plant 30 inches and a large cage.
Idaho tomatillos, 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 | Plant out | First harvest | Days |
|---|---|---|---|---|
| TomatilloToma Verde | Apr 2 | May 21 | Jul 30 | 70 from transplant |
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.
Tomatillos in Idaho, city by city
Tomatillo, scheduled from each city's nearest NOAA station — the same dates as its frost page.
| City | Last frost | Start indoors | Plant out | First harvest |
|---|---|---|---|---|
| Boisezone 7a | Apr 24 | Mar 13 | May 1 | Jul 10 |
| Meridianzone 7a | Apr 24 | Mar 13 | May 1 | Jul 10 |
| Nampazone 7a | Apr 29 | Mar 18 | May 6 | Jul 15 |
| Caldwellzone 7a | Apr 29 | Mar 18 | May 6 | Jul 15 |
| Idaho Fallszone 5b | May 9 | Mar 28 | May 16 | Jul 25 |
| Pocatellozone 6a | May 2 | Mar 21 | May 9 | Jul 18 |
| Coeur d'Alenezone 6b | Apr 22 | Mar 11 | Apr 29 | Jul 8 |
| Twin Fallszone 7a | Apr 25 | Mar 14 | May 2 | Jul 11 |
| Post Fallszone 6b | Apr 22 | Mar 11 | Apr 29 | Jul 8 |
What Idaho tomatillos need
Toma Verde Tomatillo SeedMust have
Salsa verde is not a green tomato sauce — it is a tomatillo sauce, and the difference is the tartness and the natural pectin that makes it cling. There is no substitute.
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.
Seedling Heat Mat + Digital ThermostatMust have
Peppers germinate on soil temperature, not air temperature. At 65 °F a habanero takes a month and half of them rot; at 85 °F it is up in eight days. The thermostat is the half that matters.
T8 Full-Spectrum Grow Lights, 1 ft 4-packMust have
A south window in March delivers a fraction of the light a pepper seedling needs, and the plant tells you by stretching. Two inches of LED above the canopy for 16 hours a day fixes it permanently.
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.
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.
Organic Tomato-Tone 3-4-6 with 8% CalciumMust have
The NPK ratio is the point: low nitrogen, higher potassium. Feed a tomato a high-nitrogen lawn fertiliser and you get a magnificent six-foot plant with four tomatoes on it.
58" Square Tomato Cages, 3-PackMust have
The conical wire tomato ring from the hardware store is 33 inches tall and an indeterminate San Marzano will laugh at it in July. Height and square geometry are what actually hold a loaded plant.
Garden Harvest Basket with Tool Caddy
A harvest basket that doubles as a colander means the hose rinse happens in the garden, and the dirt stays outside. On a 20-pound tomato day that is a genuine time saving.
Stainless Steel Food Mill, 3 discsMust have
A blender pulverises tomato skins and seeds into the sauce, which is where bitterness comes from. A mill separates them out — no blanching, no peeling, no ice bath. It removes an entire hour from sauce day.
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Tomatillos in Idaho: questions
When should I plant tomatillos in Idaho?
Transplant around May 21 at the statewide median; across the state that date runs from May 1 in the warmest tenth of Idaho's ZIP codes to Jun 16 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 do I start tomatillos seeds indoors in Idaho?
Around Apr 2 for Tomatillo: 6 weeks before the statewide median last frost, on soil held at 75–85 °F.
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 tomatillos be ready to harvest?
Tomatillo planted on the statewide date is ready around Jul 30: 70 days from transplant.
More for Idaho
- When to plant tomatoes
- When to plant peppers
- When to plant basil
- When to plant onions
- When to plant cilantro
- When to plant carrots
- When to plant mustard greens
Tomatillos in every state → · Idaho frost dates → · How frost-date math works →