Happy Valley, Alaska, sits in USDA hardiness zone 6a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Among the crops suited to this profile: cabbage, blackberry, california poppy, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Happy Valley, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Happy Valley lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around Happy Valley — soil, climate, flood, and parcel records. How we handle your address.
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Happy Valley — the short answer
Happy Valley, Alaska: USDA zone 6a, about 148 days between hard freezes, across 56K acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 2
- Kenai Peninsula Borough normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Sep 27
- Kenai Peninsula Borough normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~148
- Kenai Peninsula Borough normal — NOAA 1991–2020, nearest to this town
- Town area
- 56K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. No 30-year normal resolves at this town’s own centroid, so the hard-freeze dates are Kenai Peninsula Borough’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 6a is Happy Valley's average, not your lot's — a low corner or a tree line moves it. Against Happy Valley's 148-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Happy Valley
Each reading below is measured for Happy Valley itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsHappy Valley runs about 148 days between hard freezes (read from Kenai Peninsula Borough, the closest normal to Happy Valley) — a short growing season.
Long-maturing crops like melons, sweet potatoes, and winter squash can run out of runway before the first hard freeze, ripening late or not at all.
Lead with fast-maturing varieties, and stretch the season on both ends with cold frames, low tunnels, or a greenhouse.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredHappy Valley sits in USDA hardiness zone 6a.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
What Grows in Happy Valley
Every plant below cleared Happy Valley's own zone 6a and its 148-day season. Each card opens that plant's Alaska profile. How we score.
Is it too late to plant in Happy Valley?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Apr 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 2 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 27 — long-season crops need about 90 days of runway, quick greens only 30. Short seasons reward decisiveness — quick-maturing varieties late, hardy greens under cover, and next year’s garlic in the ground before it closes.
What's on the federal record near Happy Valley
Closest first, within ~10 miles of Happy Valley. Listing isn't leaking, and distance isn't exposure.
- HAPPY VALLEY OIL FIELDBrownfields · 6.2 mi
- SC00301418ADBB1 004Nitrate · 7.6 mi
- Anchor Point TesoroUnderground Storage Tanks · 7.7 mi
- Eric Eugene HillUnderground Storage Tanks · 7.9 mi
- C.A.P.G. - Robert W. CraigUnderground Storage Tanks · 7.9 mi
- ANCHOR POINT PIPELINE PROJECTBrownfields · 9.9 mi
Measured from Happy Valley's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Happy Valley.
Sources Checked
within ~10 miles of Happy Valley
Severity Distribution
within ~10 miles of Happy Valley
Highest-Severity Sites
Know Before You Grow
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Happy Valley
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Happy Valley average
Your land is one point inside Happy Valley
Everything above resolves to Happy Valley as a whole — one PHZM band, read across 56K acres, with hard-freeze dates borrowed from Kenai Peninsula Borough’s record because no 30-year normal resolves at this town’s own centroid. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at town scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the Happy Valley Average
Happy Valley Average
- ●USDA Zones 6a, averaged across Happy Valley
- ●One soil character for all of Happy Valley
- ●Frost dates read at Happy Valley's scale: May 2 to Sep 27
YOUR Parcel
- ✓Your exact zone, not Happy Valley's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Happy Valley
Pull a site-specific report for your exact address in Happy Valley, Alaska — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Happy Valley averages can't show:
We read public map data around Happy Valley — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Happy Valley average
How we know this about Happy Valley
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Kenai Peninsula Borough’s record, because none resolves here; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at town grain anywhere on this page — there is no town-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Happy Valley
When does frost risk typically end in Happy Valley?
The last hard freeze (28°F) in Happy Valley typically lands around May 2, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about May 23.
When is the first frost in Happy Valley?
The first hard freeze (28°F) in Happy Valley typically arrives around Sep 27, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 13, so the watching starts about Aug 28 — about 148 days after the spring freeze cleared.
How long is the growing season in Happy Valley?
Measured between 28°F hard freezes, Happy Valley sees about 148 frost-free days — roughly May 2 through Sep 27, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 23 to Sep 13, about 113 days.
Is the soil safe to grow vegetables in Happy Valley?
The federal record around Happy Valley is light — 8 documented sites across the 9 federal source types we checked, mostly Brownfields entries (3), the nearest Brownfields record about 6.2 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do gardeners stretch the season in Happy Valley?
With about 148 frost-free days between hard freezes, Happy Valley rewards the classic extension moves: floating row cover buys roughly two to four extra weeks at each shoulder — on this season that is a working window nearer 176 to 204 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 2 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Happy Valley's scale — its 6a band and its 148-day season. Your yard writes its own version of Happy Valley's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Happy Valley’s own scale
4 of the readings below were taken at Happy Valley's own scale — the 56,449 acres it covers and 8 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Happy Valley's own USDA hardiness band, zones 6aUSDA PHZM 2023
- 8 documented contamination sites on the federal record near Happy Valley, the closest Brownfields record about 6.2 miles out from the town centreFederal environmental registers
- Happy Valley's boundary and the 56,449 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~148-day seasonGrowable Ground crop-matching engine
Inherited from a wider read
- The 28°F hard-freeze dates — Happy Valley has no normal of its own, so its county's is the closest measured readfrom Kenai Peninsula Borough
- Soil character — no town-scale survey exists, so Happy Valley's 56,449 acres read through its county's SSURGO summaryfrom Kenai Peninsula County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Kenai Peninsula County
- The growing challenges every Alaska grower plans around — written at state scale, so they stay on the state guidefrom Alaska
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Kenai Peninsula County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Happy Valley's 56,449 acreswhy one lot differs from the next →
- Which side of Happy Valley you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 56,449 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 6.2 miles out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Happy Valley-wide figureread your own land →
More in Alaska
Wider growing context
What grows across AlaskaHappy Valley sits outside our named growing regions, so Alaska as a whole is its closest context here.
Nearby growing guides