Illustration
Shadowland Autumn Frost
Hosta 'Autumn Frost'
Also called autumn frost hosta and shadowland autumn frost hosta
Shadowland Autumn Frost blooms from July through August.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Shadowland Autumn Frost
Plant it in part shade. It prefers moderate water. It is hardy in USDA zones 3–9. Expect it to reach about 16 in tall and 20 in wide at maturity, in roughly 3 years (a house reading).
What was checked
Mature height and spread, hardiness zones, sun, water, bloom months and color and the trait tags were checked against named botanical sources for this plant, with what the sources could not settle written down; years to mature size rests on a recorded house rule where no publisher states one, and is marked so; its common name and alternate names have not been checked yet. Each fact above carries its own mark. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant Shadowland Autumn Frost
Plant Shadowland Autumn Frost in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 6, the middle of its hardy zones 3 to 9, spring means March to May and fall means August or September. Once settled, it blooms from July to August.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 6, the middle of this plant's hardy range, start with zone 6 in March. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Shadowland Autumn Frost get?
16 intall5 ft 7 inan adult20 inwideSee Shadowland Autumn Frost in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Shadowland Autumn Frost
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Shadowland Autumn Frost about 20 in apart, center to center, so each plant has room to reach its full width.
Add Shadowland Autumn Frost to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
Shadowland Autumn Frost's height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 8 published sources on September 26, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources.
- Missouri Botanical GardenPlant Finderheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases and pests
- Walters Gardensthe breeder and introducer, Zeeland, Michiganheight, spread, hardiness zones, sun, water, bloom months and color, trait tags and soil
- whiteflowerfarm.comWhite Flower Farm (Litchfield, Connecticut)height, spread, hardiness zones, sun, bloom months and color, trait tags, soil and pests
- US plant patent (Google Patents)Google Patents; the breeder's filing, one voice with Walters Gardensheight, hardiness zones, water, bloom months and color, trait tags, soil and diseases
- sugarcreekgardens.comSugar Creek Gardens (St. Louis area, Missouri)spread, hardiness zones, water, bloom months and color, soil and pests
- Plant Addictsheight, hardiness zones, bloom months and color, trait tags and pests
- nhhostas.comNew Hampshire Hostas (South Hampton, New Hampshire)spread, bloom months and color, trait tags and pests
- ASPCAAnimal Poison Control Centertoxicity
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Shadowland Autumn Frost
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Toxic to dogs, cats and horses. All parts contain saponins; eating it causes vomiting, diarrhea and depression (lethargy). per ASPCA and NC State
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Design a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.