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USDA Hardiness Zone Chart

Plant Hardiness Zones - Important Information for Gardening Success

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Enter your zip code to find your growing zone

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Zones are sometimes subdivided into a colder
half (A) and a warmer half (B): for example 5A or 7B.

There are thousands of plant varieties that will grow for U.S. gardeners but not all plants will thrive in all areas of our vast country.

While tropical plants may be happy in Florida gardens, they'll likely freeze and die in Chicago winters. Likewise, peonies and tulips, plants that require winter cold to flourish, will thrive in parts of the country with freezing winter temperatures but won't in the Deep South. How do you know which plants will work in your region?

Hardiness Zones were developed to support informed decisions. Each region has been assigned a zone; just use the Zone Finder (left) to determine yours.

With this information, look for plants that list your hardiness zone after the word "Hardiness". So, if you garden in zone 6, plants with hardiness ratings that include zone 6 (zones 3-8 or zones 6-10) should thrive in your climate year round.

Tip: Gardeners sometimes fall in love with plants that aren't hardy in their region. Must broken hearts follow? No, but the plants in question will need special attention. Suppose you love freesia but don't live in zones 9-11 where these tender beauties are hardy. To have multi-season success with freesia you'll have to over winter them in a warm place like a heated greenhouse or on your windowsill. Alternately, you may treat them as annuals; enjoying their blooms the first season and replacing them next year, like you do with petunias. This is the easiest approach and a successful way to fool Mother Nature for one season.


Allium	X	X	X	X	X	X	X	X	Alliums grow in a wide variety of climates; check specific cultivars for zone hardiness.
Amaryllis						X	X	X	All amaryllis grow only in warmer zones outdoors but can be grown indoors anywhere.
Anemone			X	X	X	X	X	X	For the most winter hardy anemones choose Blanda Mix. Others are hardy in zones 7-10.
Astilbe	X	X	X	X	X	X	X		Excellent winter hardy and heat tolerant plant suitable for most parts of the country.
Belladonna Lilies					X	X	X	X	Belladonnas like hot, dry weather and are winter hardy to zone 7.
Babiana						X	X	X	Babiana are South African plants that thrive in warm, dry Mediterranean climates.
Bleeding Hearts	X	X	X	X	X	X	X		Hardiness varies; bleeding hearts will thrive in intense cold but not extreme dryness.
Callas				X	X	X	X	X	Winter hardiness varies by cultivar in zones 6 and 7 but all varieties thrive in warmer areas.
Calochortus				X	X	X	X	X	All varieties are winter hardy as far north as zone 7; for zone 6 choose Golden Orb or Venustus.
Camassia		X	X	X	X	X	X	X	Happy in a wide range of temperatures, most camassia prefer a somewhat moist setting.
Daylilies	X	X	X	X	X	X	X		There's a daylily cultivar (or many) for every growing zone; check specifics for individual varieties.
Eremurus				X	X	X	X		Eremurus is happiest in moderate to warm climates and thrives in average to dry environments.
Erythronium	X	X	X	X	X	X	X		Very cold hardy, dog tooth violets grow in almost all US zones, preferring woodland-like settings.
Freesia							X	X	Freesia prefer warm sites; they are not winter hardy in areas colder than zone 9.
Fritillaria	X	X	X	X	X	X	X		With a variety of forms and native regions, Fritillaria zones vary; check individual variety listings.
Giant White Squill						X	X	X	Giant White Squill survives in moderate zone 8; loves hot zones 9 and 10. Likes dry settings.
Geraniums		X	X	X	X	X	X		Winter hardy geraniums come back year after year in most of the country; see individual listings.
Glory of the Snow	X	X	X	X	X	X	X		Easy to please, Glory of the Snow (Chinodoxia) cultivars are hardy in almost all areas of the U.S.
Grape Hyacinths	X	X	X	X	X	X	X	X	Very winter hardy and able to mange hot areas, grape hyacinths will grow in most of the country. See cultivar listings.


Hostas	X	X	X	X	X	X	X		With cultivars for every zone, hostas can be grown across the country. Check zone information for each variety.
Hyacinths		X	X	X	X	X			All our hyacinths are winter hardy in cold regions and will return year after year in zones 4-8.
Iris, Dutch			X	X	X	X	X		Preferring moderate to warm climates, Dutch iris vary in hardiness; check cultivar listings.
Iris, Japanese		X	X	X	X	X	X		Winter hardy from zones 4 or 5 (see individual listings) through 9, These grow in most of the US.
Iris, Reblooming Bearded	X	X	X	X	X	X	X	X	Bearded iris vary widely as far as climate preference; see individual product listings.
Ixia						X	X	X	Ixia is not winter hardy in cold areas; will return year after year outdoors in warm zones 8-10.
Leucocoryne						X	X	X	All cultivars of leucocryne are hardy in warm zones 8-10.
Narcissus, Daffodils	X	X	X	X	X	X	X	X	There's a daffodil cultivar (probably many) for every growing zone; check specifics listed with individual varieties.
Narcissus, Paperwhites						X	X	X	Primarily grown indoors where zone information is irrelevant. Requires the warm weather of zones 8-10 outside.
Ornithogalum			X	X	X	X	X	X	All these thrive in the warm zone 9 (some in 10); cold hardiness varies. Check individual listings.
Oxalis		X	X	X	X	X	X	X	For greatest cold hardiness choose Adenophylla; the others prefer zones 8-10. Grow indoors anywhere in good sunlight.
Ranunculus						X	X	X	Ranunculus are hardy in zones 8-10 but can be grown as annuals (in spring) in cooler areas. Start before weather turns hot.
Scilla		X	X	X	X	X	X	X	Heat and cold tolerance varies by cultivar; see individual listings.
Snowdrops	X	X	X	X	X	X	X		Snowdrops are very cold hardy (zone 3) and manage up to zone 9 heat; see individual listings.
Spanish Bluebells	X	X	X	X	X	X			Comfortably surviving very cold winters, Spanish Bluebells grow well as far south as zone 8.
Sparaxis						X	X	X	Sparaxis require warm settings; they are not winter hardy in areas colder than zone 8.
Tritonia						X	X	X	Tritonia prefer warm settings; they are not winter hardy in areas colder than zone 8.
Tulips (species)	X	X	X	X	X	X	X		Species tulips are very cold tolerant; they can also manage dry heat, as far south as zone 9. Check individual variety listings.
Watsonia					X	X	X	X	Watsonia cultivars are hardy from zones 7 or 8 through 10; check individual variety listings.

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