Perennial

When to Plant Hostas in Utah

The king of shade gardens. Hostas come in hundreds of varieties and get more beautiful with each passing year.

The Short Answer

In Utah, plant hostas based on your regional frost dates. Wasatch Front (SLC) has a last frost around Apr 20 - May 10, while Southern Utah sees frost end around Apr 10 - May 1. Arid climate. Intense sun. Low humidity. Wide temperature swings. Irrigation essential everywhere.

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

Hostas 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

Transplant Outside
0 wks after frost

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

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

Transplant Outside
0 wks after frost

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

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

Transplant Outside
0 wks after frost

Growing Hostas in Utah

Hostas in Utah's Climate

Hostas grow in the cooler parts of your zone but struggle in the warmest areas. Mountain regions are excellent. Piedmont and urban areas need deep shade and consistent moisture. Choose thick-leaved, heat-tolerant varieties (Sum and Substance, Guacamole) — thin leaves scorch in warm conditions.

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. Hostas 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 hostas — adjust your planting dates to match your specific region.

Growing Tips

Plant divisions or nursery plants in spring or fall. Slugs are the main enemy — use iron phosphate bait. Mulch to retain moisture.

Companion Planting

Plant hostas alongside these companions for better growth:

Ferns Astilbe Heuchera

The Bottom Line

Hostas 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

Hostas Growing Guide National planting guide with all states Utah Planting Calendar All plants for Utah Hostas in Alabama Alabama planting dates Hostas in Alaska Alaska planting dates Hostas in Arizona Arizona planting dates Hostas 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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