Diomede, Alaska, sits in USDA hardiness zone 3b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
The conditions favor cabbage, potato, rhubarb, and kale, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Diomede, 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 Diomede 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 Diomede — soil, climate, flood, and parcel records. How we handle your address.
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Diomede — the short answer
Diomede, Alaska: USDA zone 3b, about 118 days between hard freezes, across 2K acres of city.
- USDA zone
- 3b
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 24
- Nome Census Area normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Sep 19
- Nome Census Area normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~118
- Nome Census Area normal — NOAA 1991–2020, nearest to this town
- City area
- 2K 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 Nome Census Area’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 3b is Diomede's average, not your lot's — a low corner or a tree line moves it. Against Diomede's 118-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Diomede
Each reading below is measured for Diomede itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsDiomede runs about 118 days between hard freezes (read from Nome Census Area, the closest normal to Diomede) — 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
MeasuredDiomede sits in USDA hardiness zone 3b.
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 Diomede
Plants matched to Diomede's USDA zones 3b, ordered by how much hardiness margin each has here — the ones with room to spare at both ends of this town's band lead. Each links to its full growing profile.
Is it too late to plant in Diomede?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Apr 26; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 24 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 19 — long-season crops need about 90 days of runway, quick greens only 30. When the window is tight, the fall moves are quick ones — baby greens, radishes, and garlic set for next season.
Environmental Check
No contamination sources found near Diomede
We checked 9 federal environmental databases and found no recorded contamination sites in this area. A clean starting point for growing.
Your land is one point inside Diomede
Everything above resolves to Diomede as a whole — one PHZM band, read across 2K acres, with hard-freeze dates borrowed from Nome Census Area’s record because no 30-year normal resolves at this city’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 city 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 Diomede Average
Diomede Average
- ●USDA Zones 3b, averaged across Diomede
- ●One soil character for all of Diomede
- ●Frost dates read at Diomede's scale: May 24 to Sep 19
YOUR Parcel
- ✓Your exact zone, not Diomede's 3b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Diomede
Pull a site-specific report for your exact address in Diomede, Alaska — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Diomede averages can't show:
We read public map data around Diomede — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Diomede average
How we know this about Diomede
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Nome Census Area’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 city grain anywhere on this page — there is no city-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 Diomede
When does frost risk typically end in Diomede?
The last hard freeze (28°F) in Diomede typically lands around May 24, 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 Jun 14.
When is the first frost in Diomede?
The first hard freeze (28°F) in Diomede typically arrives around Sep 19, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 5, so the watching starts about Aug 20 — about 118 days after the spring freeze cleared.
How long is the growing season in Diomede?
Measured between 28°F hard freezes, Diomede sees about 118 frost-free days — roughly May 24 through Sep 19, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 14 to Sep 5, about 83 days.
Is the soil safe to grow vegetables in Diomede?
No database can certify soil, but the federal record here is clean: we checked all 9 federal contamination source types and found no documented sites within the search radii around Diomede. That means nothing is on record — not that the land is certified clean — so a one-time soil test is still the way to know your own yard's history.
How do gardeners stretch the season in Diomede?
With about 118 frost-free days between hard freezes, Diomede 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 146 to 174 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 24 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Diomede's scale — its 3b band and its 118-day season. Your yard writes its own version of Diomede'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 Diomede’s own scale
2 of the readings below were taken at Diomede's own scale — the 1,556 acres it covers; 6 are borrowed from a wider read, named and linked below.
Measured here
- Diomede's own USDA hardiness band, zones 3bUSDA PHZM 2023
- Diomede's boundary and the 1,556 acres inside itUS Census TIGER/Line 2025
Inherited from a wider read
- The 28°F hard-freeze dates — Diomede has no normal of its own, so its county's is the closest measured readfrom Nome Census Area
- Soil character — no town-scale survey exists, so Diomede's 1,556 acres read through its county's SSURGO summaryfrom Nome County
- The candidate plant list — Alaska's curated set, filtered to this zone band and re-ordered by how much margin each has herefrom Alaska
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Nome 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 Nome County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Diomede's 1,556 acreswhy one lot differs from the next →
- Which side of Diomede you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,556 acresreading your own microclimate →
- How much sun your beds actually get once the trees leaf outmeasuring sun honestly →
- 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 Diomede-wide figureread your own land →
More in Alaska
Wider growing context
What grows across AlaskaDiomede sits outside our named growing regions, so Alaska as a whole is its closest context here.
Nearby growing guides