Generally — Most Areas
Kentucky bluegrass (zones 2-7) suits most of Alaska (1a-9a) — zones 2-7 are in range, and the rest of the state is the exception.
Kentucky Bluegrass in Alaska — the short answer
Kentucky Bluegrass in Alaska: hardy in zones 2–7, full sun.
- Plant zones
- 2-7
- Not verified — NC State Extension Gardener Plant Toolbox lists zones 3a–7b
- Alaska zones
- 1a-9a
- USDA PHZM 2023
- Frost window
- Apr 16 - May 15 – Sep 24 - Oct 29
- NOAA RCC ACIS 1991-2020, 28°F
- Shortest county season
- 85 days
- NOAA Regional Climate Centers ACIS station record, 1991-2020, county 28°F killing freeze
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — per-field provenance varies and is published with the dataset.
Your yard isn't the whole zone.
Alaska spans zones 1a-9a, 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 bluegrass against your parcel's actual hardiness, soil, and sun.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Alaska is not one climate
Alaska’s winter-low ladder runs across 30 counties, from zone 1 in Yukon-Koyukuk County to zone 7.5 in Chugach County. That is 65°F between the two counties’ average coldest night — the difference between kentucky bluegrass overwintering in the ground and coming under cover.
The middle half of 30 counties runs 2.5–5 zones, with a median of 4 zones — a 6.5-zone span end to end.
Measured across 30 Alaska counties. USDA PHZM 2023, per county. Quartiles are order statistics — every figure shown is a value a real county recorded, not an interpolation. Your own site sits somewhere inside this range; a parcel report resolves where.
Where in Alaska Fits Best
Kentucky Bluegrass is rated for zones 2–7 — a cold floor USDA puts at -50 to -40°F. Against Alaska’s 30 counties that band holds in 14 of them, and the line runs at Denali County (zone 2a-4b), the coldest county still inside it.
Inside zones 2–7
14 counties
- Fairbanks North Star County · zone 2a-4a
- Bethel County · zone 2b-5a
- Matanuska-Susitna County · zone 2b-5b
3 of 14 shown
Below the zone 2 floor
4 counties
- Yukon-Koyukuk County · zone 1a-4a
- North Slope County · zone 1b-4a
- Northwest Arctic County · zone 1b-4a
3 of 4 shown
Winter cold is the limit here — the same plant works in a container that comes under cover.
County hardiness zones: USDA Plant Hardiness Zone Map (PHZM) 2023, per county. A zone is a 10°F band of average annual extreme minimum temperature, so the floor above is the band the plant's rating denotes, not a single measured kill point. Slope, shelter and cold-air drainage routinely move a site half a zone either way from its county figure — which is the part only your address resolves.
Even within Alaska's zones 1a-9a, county microclimates differ enough to change what thrives. These counties carry the closest zone match for kentucky bluegrass (USDA PHZM 2023):
Zone Comparison
Kentucky Bluegrass Needs
- USDA Zones: 2-7
- Sun: Full Sun
- Mature size: 2 ft tall
- Drought tolerance: Medium
Alaska Has
- USDA Zones: 1a-9a
- Last Hard Freeze (28°F): Apr 16 - May 15
- First Hard Freeze (28°F): Sep 24 - Oct 29
- Annual Rainfall: 10-160 inches
- Common Soils: Permafrost, Glacial silt, Volcanic ash
Plant Zone Range (zones 2-7)
Preferred Soil pH
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS, and university Extension sources — per-field provenance varies and is published with the dataset. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Kentucky Bluegrass in Alaska
The frost window
Across Alaska, the last spring hard freeze (28°F) clears between Apr 16 and May 15, and the first fall hard freeze lands between Sep 24 and Oct 29 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 132-day window you can count on — up to 196 days on a mild site in a kind year. That marks the hard freeze, not the last light frost, so tender transplants usually wait another 2-3 weeks.
Winter standing
Alaska runs as cold as USDA zone 1, and no sourced winter-hardiness floor is on record for kentucky bluegrass, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether kentucky bluegrass is a permanent planting or a replant-every-spring crop for you turns on your own zone within Alaska; check its hardiness range against that before treating it as long-lived ground.
Timing tuned to sub-state frost dates — North Slope County, not the statewide average.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: Growable Ground Plant Database — frost-free days from FAO ECOCROP, days to harvest from university Extension production guides, and growing-degree-day and chill-hour minimums that are compilation estimates rather than published figures. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Soil + Drainage Fit
Kentucky Bluegrass tolerates a wide pH range (pH 4.5-8.3) — 3.8 units, acid ground through alkaline — so soil acidity is rarely what limits it in Alaska. A soil test is still worth having, but for what else it tells you about this site, not to clear this plant. It will grow across that whole span, but it does best between pH 5.5 and 7 — worth knowing before you decide whether a Alaska soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your Alaska site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Your land, not the state average
SSURGO maps about 16.6% of Alaska as poorly or somewhat-poorly drained, and the class flips parcel to parcel. Kentucky Bluegrass sits mid-range for drought tolerance, so either extreme can cost you — your soil map unit, not the state average, is the real answer.
Check your parcel → Source: USDA NRCS SSURGO.
Plant pH requirements: FAO ECOCROP and USDA PLANTS, with the remaining rows from other published sources or Growable Ground compilation. Drainage: FAO ECOCROP, with the remaining rows from other published sources or Growable Ground compilation. Alaska soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
What Else to Consider for Kentucky Bluegrass in Alaska
Zone compatibility tells you about winter cold survival — but Alaska growers also need to think about:
Extremely short growing season (70-110 frost-free days)
Permafrost prevents deep root growth in many areas
Limited soil development in glacial terrain
Growing kentucky bluegrass here specifically
Kentucky Bluegrass rates to USDA zones 2–7 and takes frost damage on growing tissue around 32°F (FAO ECOCROP), but cold isn't the risk in Alaska — wet is: with roughly 16.6% of its soils poorly-drained (SSURGO), soggy ground rots the crown.
Give kentucky bluegrass a raised bed or mounded row with coarse amendment so its crown never sit wet. How to handle it →
What to actually do about these — and the constraints that apply to every Alaska grower, not just kentucky bluegrass — is covered on the Alaska growing guide.
Timing shifts within Alaska
Alaska isn't one climate. In North Slope County, the last hard freeze (28°F) holds until about Jun 7 — roughly 33 days later than the recorded state median — so plant kentucky bluegrass to your county's window, not the statewide date.
County last-freeze dates: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F freeze (earlier than the folk 32°F "last frost"). A parcel report resolves your address's own frost dates.
Where in Alaska Kentucky Bluegrass Is Zone-Hardy
Kentucky Bluegrass is rated for USDA zones 2–7. 14 of Alaska’s 30 counties fall inside that band. The coldest that does is Denali County at zone 2a-4b. 1 county sits above its zone 7 ceiling, where the limit is too little winter chill rather than too much cold. Where you are in Alaska decides this one.
Across those 30 counties Alaska’s winter-low ladder runs from zone 1a-4a in Yukon-Koyukuk County to zone 7b in Chugach County — 6.5 USDA zones of spread, which is 65°F between the two counties’ average coldest night of the year. That is why a statewide hardiness answer is where you start and not where you finish.
The planting window moves with it. North Slope County holds its last hard freeze (28°F) until about Jun 7, while Sitka County is clear by Mar 24 — 75 days apart. Set kentucky bluegrass out on your county’s date, not the state’s.
County hardiness zones: USDA Plant Hardiness Zone Map (PHZM) 2023, per county. County last-freeze dates: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F killing freeze — earlier than the folk 32°F "last frost". Kentucky Bluegrass’s zone 2–7 band: Not verified — NC State Extension Gardener Plant Toolbox lists zones 3a–7b. A parcel report resolves your address’s own zone and frost dates rather than its county’s.
Alaska Cooperative Extension
For Alaska-specific cultivar recommendations, planting calendars, and pest pressure for kentucky bluegrass, the canonical source is UAF Cooperative Extension Service. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Kentucky Bluegrass native to Alaska?
No — the USDA PLANTS Database lists Kentucky Bluegrass as introduced rather than native in the Lower 48, so it is not part of Alaska's native flora. It grows here as a garden plant; pairing it with a few Alaska natives keeps local pollinators fed too.
Looking for plants that belong here? The Alaska 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 Bluegrass in Alaska
When can I plant Kentucky Bluegrass in Alaska?
Alaska's last spring hard freeze (28°F) clears between Apr 16 and May 15, and the first fall hard freeze lands between Sep 24 and Oct 29 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Kentucky Bluegrass, so this page does not state whether it overwinters in Alaska and publishes no fall establishment date for it — check its hardiness range against your own zone before treating it as a permanent planting.
What hardiness zone is Kentucky Bluegrass grown in across Alaska?
Alaska spans USDA hardiness zones 1a-9a (USDA ARS PHZM 2023). Kentucky Bluegrass carries a range of zones 2-7, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Alaska site have?
A typical Alaska site sees ~147 frost-free days per year (derived from NOAA Regional Climate Centers ACIS station record, 1991-2020). Kentucky Bluegrass needs 120+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date. In cooler counties like North Slope, the freeze-free season runs shorter than the state average, so verify your own county's window.
Is Kentucky Bluegrass native to Alaska?
No — the USDA PLANTS Database lists Kentucky Bluegrass as introduced rather than native in the Lower 48, so it is not part of Alaska's native flora. It grows here as a garden plant; pairing it with a few Alaska natives keeps local pollinators fed too.
How should I amend the soil for Kentucky Bluegrass in Alaska?
Kentucky Bluegrass tolerates pH 4.5-8.3 and well (dry spells) drainage (FAO ECOCROP). That is a 3.8-unit span, acid ground through alkaline, so pH is rarely what limits this plant on a Alaska site — amend for drainage and organic matter first.
Will Kentucky Bluegrass actually grow on my specific land in Alaska?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores kentucky bluegrass 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 Alaska
State-level data is a sketch. Your Growable Ground report scores kentucky bluegrass against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that Alaska kentucky bluegrass averages can't show:
We read public map data around Alaska — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Alaska kentucky bluegrass average
Explore More
Growing guides for kentucky bluegrass
Explore Alaska county by county
Alaska carries 30 counties with their own USDA zone — a sample of the growing pages for kentucky bluegrass there:
Where else kentucky bluegrass grows
Kentucky Bluegrass's zone band crosses state lines — these are the states closest to Alaska in winter climate where it also has a page, plus the far ends of its range. Each one re-answers the question with that state's own record.
More to grow in Alaska
Alaska has a growing page for 1,011 plants — a rotating sample of the rest of the shelf.
Analysis by the Growable Ground research team, grounded in USDA PLANTS, USDA NRCS SSURGO, NOAA Climate Normals (1991-2020), and named Cooperative Extension sources. How we know →
Cite this dataset
Kirchick, M. (2026). Growable Ground Plant Database [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21435643
Licensed CC BY-NC 4.0. DOI 10.5281/zenodo.21435643
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