Generally — Most Areas
Kentucky coffeetree (zones 4-10) partially overlaps with Idaho (3b-7a). It can grow in zones 4-7 within the state.
Your yard isn't the whole zone.
Idaho spans zones 3b-7a, but your yard sits in exactly one — and slope, tree cover, and cold-air pockets nudge it further. Enter your address and we'll score kentucky coffeetree against your parcel's actual hardiness, soil, and sun.
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Zone Comparison
Kentucky Coffeetree Needs
- USDA Zones: 4-10
- Soil pH: 6 - 8
- Sun: Full Sun
- Frost-Free Days: 0+
Idaho Has
- USDA Zones: 3b-7a
- Last Frost: Apr 15 - Jun 15
- First Frost: Sep 1 - Oct 15
- Annual Rainfall: 8-35 inches
- Common Soils: Volcanic ash, Silt loam, Sandy loam
Plant Zone Range (zones 4-10)
Preferred Soil pH
Plant data: USDA PLANTS Database / plant_species_v5.csv. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Kentucky Coffeetree in Idaho
The frost window
Across Idaho, the last spring frost clears between Apr 15 and Jun 15, and the first fall frost lands between Sep 1 and Oct 15 (NOAA Climate Normals 1991-2020). Counting from the latest last frost to the earliest first frost, that's a 78-day window you can count on — up to 183 days on a mild site in a kind year.
Frost hardiness
Kentucky Coffeetree is cold-hardy to -32°F (USDA PLANTS Database), so you can plant on the early side of Idaho's window — even a few weeks before the final frost date.
Establishment timing
As a long-lived plant, kentucky coffeetree isn't racing the calendar to a harvest date. Plant it in spring once the last-frost window passes so roots settle in through the full season, or in early fall while the soil still holds summer warmth.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
Zone compatibility says you can survive winter here. Whether the growing season is long enough — and warm enough — is a different question.
Frost-free days
Kentucky Coffeetree wants 0+ frost-free days; a typical Idaho site sees ~150 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Chill hours
Kentucky Coffeetree requires ~500 chill hours (32-45°F dormancy window). Idaho typically banks ~1650 chill hours per winter (MSU Extension method), which keeps this plant on track.
Climate aggregates derive from USDA NRCS county-level hardiness data + Cornell CALS Extension GDD-by-region tables + MSU Extension chill-hours-by-zone (1991-2020 NOAA Climate Normals baseline).
Soil + Drainage Fit
Kentucky Coffeetree likes near-neutral soil (pH 6-8). That's the common-ground band across Idaho's volcanic ash and silt loam — a soil test confirms it for your site.
Plant pH and drainage requirements from USDA PLANTS Database. Idaho soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Kentucky Coffeetree in Idaho — Quick Answer
- Verdict: Generally — Most Areas
- Plant Zones: 4-10 (USDA PLANTS Database)
- State Zones: 3b-7a (USDA ARS PHZM 2023)
- Growing Season: Apr 15 - Jun 15 to Sep 1 - Oct 15 (NOAA Climate Normals)
What Else to Consider
Zone compatibility tells you about winter cold survival — but Idaho growers also need to think about:
Short growing season at higher elevations
At elevation, fast varieties plus a cold frame or low tunnel reliably buy back the weeks the calendar withholds.
Arid conditions require irrigation in most of the state
Drip irrigation and deep mulch are the arid-country baseline — set the water system before the plants.
Cold winter snaps can reach -30F in mountain valleys
Plant perennials for your real zone, not an optimistic one — a -30°F night finds every zone-pushed plant.
Idaho Cooperative Extension
For Idaho-specific cultivar recommendations, planting calendars, and pest pressure for kentucky coffeetree, the canonical source is University of Idaho Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Kentucky Coffeetree native to Idaho?
Kentucky Coffeetree is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-07-01) does not document a native range in Idaho. It can still earn a place in a Idaho garden — the zone comparison above tells you whether it will thrive.
Looking for plants that belong here? The Idaho growing guide lists USDA-documented natives for the state.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Kentucky Coffeetree in Idaho
When can I plant Kentucky Coffeetree in Idaho?
Idaho's last spring frost clears between Apr 15 and Jun 15, and the first fall frost lands between Sep 1 and Oct 15 (NOAA Climate Normals 1991-2020). Kentucky Coffeetree is a long-lived planting, so target spring just after your local last frost — or early fall while the soil holds warmth — and let it establish through the season.
What hardiness zone is Kentucky Coffeetree grown in across Idaho?
Idaho spans USDA hardiness zones 3b-7a (USDA ARS PHZM 2023). Kentucky Coffeetree carries a range of zones 4-10, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Idaho site have?
A typical Idaho site sees ~150 frost-free days per year (derived from NOAA Climate Normals 1991-2020). Kentucky Coffeetree needs 0+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Kentucky Coffeetree native to Idaho?
Kentucky Coffeetree is native to parts of the Lower 48, but the USDA PLANTS Database (accessed 2026-07-01) does not document a native range in Idaho. It can still earn a place in a Idaho garden — the zone comparison above tells you whether it will thrive.
How should I amend the soil for Kentucky Coffeetree in Idaho?
Kentucky Coffeetree prefers pH 6-8 (USDA PLANTS Database). That sits in the common-ground band across Idaho soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Kentucky Coffeetree actually grow on my specific land in Idaho?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores kentucky coffeetree against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in Idaho
State-level data is a sketch. Your Growable Ground report scores kentucky coffeetree against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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