When to plant · 4 cities · zones 4b–5b

When to plant basil in Montana

Start Genovese Basil seeds indoors around Apr 22 and transplant around Jun 3 — the Montana statewide median, counted from a last spring frost of May 20 across 332 ZIP codes and 181 NOAA stations.

Apr 22Start indoors4 weeks before last frost
Jun 3Plant outMay 23 – Jun 20 across the state
May 20Last spring frostmedian · 1 in 10 years after Jun 4
Aug 2First harvest60 days from transplant

The rule: Basil is damaged below about 50 °F, well before frost: transplant two weeks after the last frost, not on it.

Montana basil, by step

Statewide median last frost May 20, first fall frost Sep 22, 2027 season. Each cultivar's own indoor lead time and days to maturity, same engine as the Plan Builder.

CultivarStart indoorsPlant outFirst harvestDays
Genovese BasilGenoveseApr 22Jun 3Aug 260 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 Montana's ZIP codes resolve to; 37 of 369 ZIPs have no datable freeze and are left out.

Basil in Montana, city by city

Genovese Basil, scheduled from each city's nearest NOAA station — the same dates as its frost page.

CityLast frostStart indoorsPlant outFirst harvest
Billingszone 5aMay 5Apr 7May 19Jul 18
Missoulazone 5bMay 10Apr 12May 24Jul 23
Great Fallszone 4bMay 6Apr 8May 20Jul 19
Bozemanzone 5aMay 23Apr 25Jun 6Aug 5

What Montana basil need

SeedsThe cultivar decides the sauce. Everything downstream is damage control.
  • Genovese Sweet Basil Seed

    The large-leaf, low-anise Italian basil that pesto is defined by. Thai and lemon basils are good plants and wrong ingredients.

StartSoil temperature and light intensity, indoors, weeks before your frost date.
  • 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.

  • 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.

GrowRoot volume, nutrition and structure. Where most home crops actually fail.
  • 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.

HarvestTiming, handling, and weighing what you actually got.
  • 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.

CookReduction, texture, and the non-reactive pans that keep tomato tasting like tomato.
  • Mesh Strainers, Stainless, 3-Count

    The last pass before bottling. A fine mesh catches the skin fragments and seed shards that make a hot sauce gritty and clog a woozy bottle's dripper insert.

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Basil in Montana: questions

When should I plant basil in Montana?

Transplant around Jun 3 at the statewide median; across the state that date runs from May 23 in the warmest tenth of Montana's ZIP codes to Jun 20 in the coldest. To cut the freeze risk to one year in ten, count from Jun 4 instead of the median last frost. Use the city table for your own town.

When do I start basil seeds indoors in Montana?

Around Apr 22 for Genovese Basil: 4 weeks before the statewide median last frost, on soil held at 70–80 °F.

When is the last frost in Montana?

The ZIP-weighted median of NOAA 1991–2020 station medians is May 20. In the warmest tenth of Montana's ZIP codes the median last frost falls on or before May 9; in the coldest tenth, on or after Jun 6.

When will Montana basil be ready to harvest?

Genovese Basil planted on the statewide date is ready around Aug 2: 60 days from transplant.

More for Montana

Basil in every state → · Montana frost dates → · How frost-date math works →