Illustration
Idaho Fescue
Festuca idahoensis
Also called bluebunch fescue and blue bunchgrass
Idaho Fescue blooms from May through July.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Idaho Fescue
Plant it in full sun. It prefers low water. It is hardy in USDA zones 3–7. Expect it to reach about 20 in tall and 16 in wide at maturity, in roughly 2 years (a house reading).
Pets
- Not yet checked for pets.
Lists differ and none is complete. If a pet eats a plant and seems unwell, call a veterinarian or a pet poison helpline.
No toxicity note is on file for Idaho Fescue. That is not a clearance: check its safety for people and pets before planting.
What was checked
Nine facts were checked against named botanical sources, each recorded beside the sources that carried it: mature height and spread, hardiness zones, sun, water, bloom months and color, the trait tags, and years to mature size, which rests on a recorded house rule where no publisher states one and is marked so. Soil, diseases, pests, toxicity and the plant's own names have not yet been read for this plant, and its trait tags are the ones a feature uses rather than every word a page prints. 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 Idaho Fescue
Plant Idaho Fescue 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 5, the middle of its hardy zones 3 to 7, spring means April to June and fall means August or September. Once settled, it blooms from May to July.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 5, the middle of this plant's hardy range, start with zone 5 in April. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Idaho Fescue get?
20 intall5 ft 7 inan adult16 inwideSee Idaho Fescue 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 Idaho Fescue
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Idaho Fescue about 16 in apart, center to center, so each plant has room to reach its full width.
Add Idaho Fescue 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
Idaho Fescue's height, spread, hardiness zones, sun, water, bloom months and color and trait tags were checked against 9 published sources on October 23, 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.
- apps.fcgov.comCity of Fort Collinsheight, spread, sun, water, bloom months and color and trait tags
- calfloranursery.comCalifornia Flora Nurseryheight, spread, sun, water, bloom months and color and trait tags
- conservationseedlings.mtdnrc.govMontana DNRC Conservation Seedling Nurseryheight, spread, hardiness zones, sun and trait tags
- plantsofthewild.comPlants of the Wildheight, hardiness zones, sun, water and trait tags
- research.fs.usda.govUSDA Forest Service, Fire Effects Information Systemheight, bloom months and color and trait tags
- Utah State University ExtensionEcoRestore Utahheight, sun and bloom months and color
- burkeherbarium.orgUniversity of Washington, Burke Herbariumheight and bloom months and color
- fieldguide.mt.govMontana Natural Heritage Program, Montana Field Guideheight
- Utah State University ExtensionRange Plants of Utahheight
How the checking works, and what each standard covers, is on the verified plants page.
Where it grows wild
Native to 12 states and 3 provinces
United States: Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, South Dakota, Utah, Washington, Wyoming
Canada: Alberta, British Columbia, Saskatchewan
Recorded growing wild in 194 counties.
Range data from the World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 4.0, adapted) and USDA PLANTS. How the native range is credited.
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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.