Cool-Season Vegetable

When to Plant Spinach in Utah

Fast from seed to salad. Spinach bolts in heat, so plant early in spring and again in fall.

The Short Answer

Spinach are cold-tolerant and do well in Utah's humid climate. You can direct sow 6 weeks before your last frost — that's as early as Apr 20 - May 10 in Wasatch Front (SLC). Utah gardeners can also plant a fall crop. Alkaline desert soils. Low organic matter. Saline soils in some areas. Heavy amendment with compost...

Utah Frost Dates

Your planting dates depend on which part of Utah you're in. Here are the frost date ranges by region:

Region Zones Last Frost (Spring) First Frost (Fall)
Wasatch Front (SLC) 6a, 6b, 7a Apr 20 - May 10 Oct 1 - Oct 20
Mountain Regions 4a, 4b, 5a May 25 - Jun 15 Aug 25 - Sep 15
Southern Utah 6b, 7a, 7b Apr 10 - May 1 Oct 10 - Nov 1

Spinach Planting Schedule for Utah

Wasatch Front (SLC) (Zones 6a, 6b, 7a)

Average last frost: Apr 20 - May 10 · Average first frost: Oct 1 - Oct 20

Direct Sow
6 wks before frost
Fall Planting
6 wks before first frost

Mountain Regions (Zones 4a, 4b, 5a)

Average last frost: May 25 - Jun 15 · Average first frost: Aug 25 - Sep 15

Direct Sow
6 wks before frost
Fall Planting
6 wks before first frost

Southern Utah (Zones 6b, 7a, 7b)

Average last frost: Apr 10 - May 1 · Average first frost: Oct 10 - Nov 1

Direct Sow
6 wks before frost
Fall Planting
6 wks before first frost

Growing Spinach in Utah

Spinach in Utah's Climate

Spinach is strictly cool-season in your warm climate. Sow from September through February. Your mild winter temperatures produce fast-growing, tender spinach without any frost protection needed. The season is short but productive. For warm-weather spinach alternatives, grow Malabar spinach — it's not true spinach but handles heat that real spinach cannot.

Soil Considerations for Utah

Alkaline desert soils. Low organic matter. Saline soils in some areas. Heavy amendment with compost and sulfur needed.

Utah Climate & Growing Season

Arid climate. Intense sun. Low humidity. Wide temperature swings. Irrigation essential everywhere. Spinach can handle frost well, which is an advantage in Utah's climate. You can push planting dates earlier in spring and extend into fall.

Growing season length varies across Utah: Wasatch Front (SLC) (6a, 6b, 7a) has a last frost around Apr 20 - May 10, while Southern Utah (6b, 7a, 7b) sees frost end around Apr 10 - May 1. This difference matters for spinach — adjust your planting dates to match your specific region.

Growing Tips

Direct sow as soon as soil can be worked in spring. For fall, plant 6-8 weeks before first frost.

Companion Planting

Plant spinach alongside these companions for better growth:

Strawberries Peas Radishes

The Bottom Line

Spinach can be grown successfully across Utah, but your exact planting dates depend on which region you're in. Wasatch Front (SLC) gardeners should plan around a Apr 20 - May 10 last frost, while those in Southern Utah can typically plant earlier. For exact dates based on your zip code, use our free planting date finder.

Related Guides

Spinach Growing Guide National planting guide with all states Utah Planting Calendar All plants for Utah Spinach in Alabama Alabama planting dates Spinach in Alaska Alaska planting dates Spinach in Arizona Arizona planting dates Spinach in Arkansas Arkansas planting dates
Note: All dates are based on NOAA 30-year Climate Normals and represent historical averages, not predictions for any specific year. Always check your local weather forecast before planting frost-sensitive crops. Learn about our data sources.

Last reviewed: March 29, 2026

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