Belfair, Washington, sits in USDA hardiness zone 8b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
These conditions suit cabbage, fig, california poppy, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Belfair, 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 Belfair 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 Belfair — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Belfair — the short answer
Belfair, Washington: USDA zone 8b, about 243 days between hard freezes, across 5K acres of town.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 17
- Mason County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Nov 15
- Mason County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~243
- Mason County normal — NOAA 1991–2020, nearest to this town
- Town area
- 5K 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 Mason County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 8b is Belfair's average, not your lot's — a low corner or a tree line moves it. Against Belfair's 243-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Belfair
Each reading below is measured for Belfair itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsBelfair runs about 243 days between hard freezes (read from Mason County, the closest normal to Belfair) — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredBelfair sits in USDA hardiness zone 8b.
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
The kind of country Belfair is in
Belfair sits in the Puget Lowland — EPA Level III, inside the wider Marine West Coast Forest. That is read at Belfair's own centroid rather than borrowed from Mason County.
What Grows in Belfair
Every plant below cleared Belfair's own zone 8b and its 243-day season. Each card opens that plant's Washington profile. How we score.
Is it too late to plant in Belfair?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Feb 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 17 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 15 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
What's on the federal record near Belfair
Closest first, within ~10 miles of Belfair. Listing isn't leaking, and distance isn't exposure.
- ALLEN M SHEARERUnderground Storage Tanks · 2100 ft
- R W HENNINGSENUnderground Storage Tanks · 1.0 mi
- M C GWIMONTUnderground Storage Tanks · 1.1 mi
- BOBS GENERAL STORE 603Underground Storage Tanks · 1.1 mi
- CENTURYLINK QCUnderground Storage Tanks · 1.2 mi
- QUALITY FOOD CENTERS QFC FUEL STOP 101Underground Storage Tanks · 1.2 mi
- WA DNR MISSION CREEK SPSUnderground Storage Tanks · 1.2 mi
- CROWN AUTO SALESUnderground Storage Tanks · 1.3 mi
- CROWN AUTO SALESBrownfields · 1.3 mi
- BELFAIR CARDLOCKUnderground Storage Tanks · 1.3 mi
- SANDY'S DELIUnderground Storage Tanks · 1.3 mi
- BELFAIR SHELL STATIONUnderground Storage Tanks · 1.3 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Belfair'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 Belfair.
Total Sites
170
within ~10 miles of Belfair
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Belfair
Severity Distribution
within ~10 miles of Belfair
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Belfair, two things run higher than the national average within ~10 miles of Belfair — PFAS (3 sites) and Nitrate (58 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Belfair
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 Belfair average
Your land is one point inside Belfair
Everything above resolves to Belfair as a whole — one PHZM band, read across 5K acres, with hard-freeze dates borrowed from Mason County’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 Belfair Average
Belfair Average
- ●USDA Zones 8b, averaged across Belfair
- ●One soil character for all of Belfair
- ●Frost dates read at Belfair's scale: Mar 17 to Nov 15
YOUR Parcel
- ✓Your exact zone, not Belfair's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Belfair
Pull a site-specific report for your exact address in Belfair, Washington — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Belfair averages can't show:
We read public map data around Belfair — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Belfair average
How we know this about Belfair
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 Mason County’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 Belfair
When does frost risk typically end in Belfair?
The last hard freeze (28°F) in Belfair typically lands around Mar 17, 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 Apr 7.
When is the first frost in Belfair?
The first hard freeze (28°F) in Belfair typically arrives around Nov 15, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 1, so the watching starts about Oct 16 — about 243 days after the spring freeze cleared.
How long is the growing season in Belfair?
Measured between 28°F hard freezes, Belfair sees about 243 frost-free days — roughly Mar 17 through Nov 15, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 7 to Nov 1, about 208 days.
Is the soil safe to grow vegetables in Belfair?
The federal record around Belfair is a meaningful one — 170 documented sites, mostly Underground Storage Tanks entries (95), the nearest Underground Storage Tanks record about 0.4 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Belfair?
From about Oct 16 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Nov 15 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Nov 15. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Belfair's scale — its 8b band and its 243-day season. Your yard writes its own version of Belfair'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 Belfair’s own scale
5 of the readings below were taken at Belfair's own scale — the 4,716 acres it covers and 170 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Belfair's own USDA hardiness band, zones 8bUSDA PHZM 2023
- 170 documented contamination sites on the federal record near Belfair, the closest Underground Storage Tanks record about 0.4 miles out from the town centreFederal environmental registers
- Belfair's boundary and the 4,716 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~243-day seasonGrowable Ground crop-matching engine
- The ecoregion at Belfair's own centroid, the Puget LowlandUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Belfair has no normal of its own, so its county's is the closest measured readfrom Mason County
- Soil character — no town-scale survey exists, so Belfair's 4,716 acres read through its county's SSURGO summaryfrom Mason County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Mason County
- The growing challenges every Washington grower plans around — written at state scale, so they stay on the state guidefrom Washington
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Mason County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Belfair's 4,716 acreswhy one lot differs from the next →
- Which side of Belfair you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,716 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.4 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 Belfair-wide figureread your own land →