Perennial

When to Plant Hostas in Arizona

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

The Short Answer

In Arizona, plant hostas based on your regional frost dates. Northern Arizona (Flagstaff) has a last frost around May 15 - Jun 5, while Southern Arizona (Tucson) sees frost end around Feb 1 - Feb 25. Extreme heat in summer lowlands. Two planting seasons in Phoenix — spring and fall (summer is too hot). High elevation...

Arizona Frost Dates

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

Region Zones Last Frost (Spring) First Frost (Fall)
Northern Arizona (Flagstaff) 4b, 5a, 5b, 6a May 15 - Jun 5 Sep 15 - Oct 10
Central Arizona (Phoenix) 9a, 9b, 10a Jan 15 - Feb 10 Dec 1 - Dec 20
Southern Arizona (Tucson) 8b, 9a, 9b Feb 1 - Feb 25 Nov 20 - Dec 15

Hostas Planting Schedule for Arizona

Northern Arizona (Flagstaff) (Zones 4b, 5a, 5b, 6a)

Average last frost: May 15 - Jun 5 · Average first frost: Sep 15 - Oct 10

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Central Arizona (Phoenix) (Zones 9a, 9b, 10a)

Average last frost: Jan 15 - Feb 10 · Average first frost: Dec 1 - Dec 20

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0 wks after frost

Southern Arizona (Tucson) (Zones 8b, 9a, 9b)

Average last frost: Feb 1 - Feb 25 · Average first frost: Nov 20 - Dec 15

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0 wks after frost

Growing Hostas in Arizona

Hostas in Arizona's Climate

Hostas are generally not viable in subtropical zones. The combination of heat, humidity, and insufficient winter dormancy prevents proper growth. Caladiums, tropical ferns, and bromeliads fill the shade-garden role that hostas play in northern gardens.

Soil Considerations for Arizona

Alkaline, mineral-rich desert soils. Low organic matter. Heavy amendment with compost essential. Caliche layers may need to be broken.

Arizona Climate & Growing Season

Extreme heat in summer lowlands. Two planting seasons in Phoenix — spring and fall (summer is too hot). High elevation has traditional cold-climate seasons. Hostas can handle frost well, which is an advantage in Arizona's climate. You can push planting dates earlier in spring and extend into fall.

Growing season length varies across Arizona: Northern Arizona (Flagstaff) (4b, 5a, 5b, 6a) has a last frost around May 15 - Jun 5, while Southern Arizona (Tucson) (8b, 9a, 9b) sees frost end around Feb 1 - Feb 25. 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 Arizona, but your exact planting dates depend on which region you're in. Northern Arizona (Flagstaff) gardeners should plan around a May 15 - Jun 5 last frost, while those in Southern Arizona (Tucson) 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 Arizona Planting Calendar All plants for Arizona Hostas in Alabama Alabama planting dates Hostas in Alaska Alaska 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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