When to plant · 24 cities · zones 6a–8b

When to plant tomatoes in Utah

Start Roma Tomato seeds indoors around Mar 24 and transplant around May 12 — the Utah statewide median, counted from a last spring frost of May 5 across 295 ZIP codes and 136 NOAA stations.

Mar 24Start indoors6 weeks before last frost
May 12Plant outApr 16 – Jun 8 across the state
May 5Last spring frostmedian · 1 in 10 years after May 28
Jul 26First harvest75 days from transplant

The rule: Six weeks indoors at 75–85 °F soil, then transplant a week after the last frost and cage at transplant.

Utah tomatoes, by cultivar

Statewide median last frost May 5, first fall frost Oct 10, 2027 season. Each cultivar's own indoor lead time and days to maturity, same engine as the Plan Builder.

CultivarStart indoorsPlant outFirst harvestDays
Roma TomatoRoma VF (determinate paste)Mar 24May 12Jul 2675 from transplant
San Marzano TomatoSan Marzano (indeterminate paste)Mar 24May 12Jul 3180 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 Utah's ZIP codes resolve to; 3 of 298 ZIPs have no datable freeze and are left out.

Tomatoes in Utah, city by city

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

CityLast frostStart indoorsPlant outFirst harvest
Salt Lake Cityzone 7bMar 31Feb 17Apr 7Jun 21
West Valley Cityzone 7bApr 8Feb 25Apr 15Jun 29
West Jordanzone 7bApr 18Mar 7Apr 25Jul 9
Provozone 7aApr 18Mar 7Apr 25Jul 9
St. Georgezone 8bMar 14Jan 31Mar 21Jun 4
Oremzone 7aApr 19Mar 8Apr 26Jul 10
Lehizone 7aApr 30Mar 19May 7Jul 21
Sandyzone 7bApr 29Mar 18May 6Jul 20
Ogdenzone 6bApr 21Mar 10Apr 28Jul 12
South Jordanzone 7aApr 18Mar 7Apr 25Jul 9
Laytonzone 7aApr 19Mar 8Apr 26Jul 10
Millcreekzone 7bApr 25Mar 14May 2Jul 16
Herrimanzone 7aApr 18Mar 7Apr 25Jul 9
Eagle Mountainzone 6bApr 30Mar 19May 7Jul 21
Taylorsvillezone 7bApr 8Feb 25Apr 15Jun 29
Saratoga Springszone 7aApr 30Mar 19May 7Jul 21
Loganzone 6aApr 30Mar 19May 7Jul 21
Murrayzone 7bApr 29Mar 18May 6Jul 20
Draperzone 7aApr 18Mar 7Apr 25Jul 9
Spanish Forkzone 7aApr 25Mar 14May 2Jul 16
Rivertonzone 7aApr 18Mar 7Apr 25Jul 9
Bountifulzone 6bApr 25Mar 14May 2Jul 16
American Forkzone 7aApr 17Mar 6Apr 24Jul 8
Tooelezone 7aMay 2Mar 21May 9Jul 23

What Utah tomatoes need

SeedsThe cultivar decides the sauce. Everything downstream is damage control.
  • Roma Tomato Seed (300+)

    The determinate paste tomato: it ripens most of its crop inside a three-week window. That is a liability for eating and an enormous advantage for sauce day.

  • San Marzano Tomato SeedMust have

    The paste tomato Italian canners actually use. Low seed cavity, low water, high pectin: it reduces to a sauce in half the time a slicer takes and never tastes thin.

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.

  • 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.

  • 72-Cell Trays with 1020 Bottoms, 5-PackMust have

    The cheap black nursery trays crack after one season and flex enough to break roots when you lift them. These do not. Over five seasons the price per use is lower than the throwaways.

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.

  • 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.

  • Rot-Stop Blossom End Rot Concentrate

    Blossom end rot is almost never a soil calcium shortage — it is a calcium *transport* failure caused by inconsistent water. A foliar calcium spray buys time while you fix the watering, which is the real cure.

  • 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.

  • Drip Irrigation System with Timer, 16 Nozzles

    Blossom end rot, split tomatoes and bitter fruit all trace back to the same thing: water that swings. A $50 timer removes the human from the loop and removes the swing.

ProtectFrost, hornworms, aphids, and the fungal pressure that follows a wet July.
  • Captain Jack Copper Fungicide, 16 oz

    Early blight and septoria arrive with a wet July and work up the plant from the bottom. Copper is preventative — sprayed after you see it, you are already losing.

  • Thuricide BT Concentrate, 16 oz

    Bacillus thuringiensis kills caterpillars and nothing else. For tomato hornworms — which can strip a plant in 48 hours — it is the most targeted tool that exists.

CookReduction, texture, and the non-reactive pans that keep tomato tasting like tomato.
  • 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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Tomatoes in Utah: questions

When should I plant tomatoes in Utah?

Transplant around May 12 at the statewide median; across the state that date runs from Apr 16 in the warmest tenth of Utah's ZIP codes to Jun 8 in the coldest. To cut the freeze risk to one year in ten, count from May 28 instead of the median last frost. Use the city table for your own town.

When do I start tomatoes seeds indoors in Utah?

Around Mar 24 for Roma Tomato: 6 weeks before the statewide median last frost, on soil held at 75–85 °F.

When is the last frost in Utah?

The ZIP-weighted median of NOAA 1991–2020 station medians is May 5. In the warmest tenth of Utah's ZIP codes the median last frost falls on or before Apr 9; in the coldest tenth, on or after Jun 1.

When will Utah tomatoes be ready to harvest?

Roma Tomato planted on the statewide date is ready around Jul 26: 75 days from transplant.

More for Utah

Tomatoes in every state → · Utah frost dates → · How frost-date math works →