Boyd, Montana, sits in USDA hardiness zone 5a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Well-matched crops include cabbage, cranberry, lavender, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in Boyd, 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 Boyd 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 Boyd — soil, climate, flood, and parcel records. How we handle your address.
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Boyd — the short answer
Boyd, Montana: USDA zone 5a, about 158 days between hard freezes, across 176 acres of town.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 6
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~158
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 176 acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 5a is Boyd's average, not your lot's — a low corner or a tree line moves it. Against Boyd's 158-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Boyd
Each reading below is measured for Boyd itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredBoyd runs about 158 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredBoyd sits in USDA hardiness zone 5a.
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 Boyd is in
Boyd sits in the Northwestern Great Plains — EPA Level III, inside the wider Great Plains. That is read at Boyd's own centroid rather than borrowed from Carbon County.
What Grows in Boyd
Every plant below cleared Boyd's own zone 5a and its 158-day season. Each card opens that plant's Montana profile. How we score.
Is it too late to plant in Boyd?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Apr 3; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 6 — long-season crops need about 90 days of runway, quick greens only 30. Even past midsummer there is room for a true fall garden here, and garlic planted near the close carries the momentum into next year.
What's on the federal record near Boyd
Closest first, within ~10 miles of Boyd. Listing isn't leaking, and distance isn't exposure.
- BOYD STOREUnderground Storage Tanks · 1.2 mi
- 05S22E03BADB01Nitrate · 3.8 mi
- 5S-21E-22abc01Nitrate · 4.9 mi
- BN RAPIDS MICROWAVEUnderground Storage Tanks · 5.0 mi
- ROCK CREEK DRILLING INCUnderground Storage Tanks · 5.1 mi
- JOLIET HIGH SCHOOLBrownfields · 5.2 mi
- JOLIET SCHOOL DIST 7Underground Storage Tanks · 5.2 mi
- TOWN OF JOLIETUnderground Storage Tanks · 5.2 mi
- COUNTRY CORNER JOLIETUnderground Storage Tanks · 5.3 mi
- 04S22E24CCDC01Nitrate · 5.3 mi
- HALLS CONOCO 501867Underground Storage Tanks · 5.3 mi
- HALLS CONOCO 505576Underground Storage Tanks · 5.3 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Boyd'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 Boyd.
Total Sites
42
within ~10 miles of Boyd
Risk Level
Low
Highest-severity
2 concentrated animal feeding operations
Sources Checked
within ~10 miles of Boyd
Severity Distribution
within ~10 miles of Boyd
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Boyd, Nitrate runs higher than the national average — 24 sites within ~10 miles of Boyd. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Boyd
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 Boyd average
Your land is one point inside Boyd
Everything above resolves to Boyd as a whole — one PHZM band and one 28°F frost record, read across 176 acres. 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 Boyd Average
Boyd Average
- ●USDA Zones 5a, averaged across Boyd
- ●One soil character for all of Boyd
- ●Frost dates read at Boyd's scale: May 1 to Oct 6
YOUR Parcel
- ✓Your exact zone, not Boyd's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Boyd
Pull a site-specific report for your exact address in Boyd, Montana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Boyd averages can't show:
We read public map data around Boyd — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Boyd average
How we know this about Boyd
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 Boyd’s own record; 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 Boyd
When does frost risk typically end in Boyd?
The last hard freeze (28°F) in Boyd typically lands around May 1, 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 22.
When is the first frost in Boyd?
The first hard freeze (28°F) in Boyd typically arrives around Oct 6, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 22, so the watching starts about Sep 6 — about 158 days after the spring freeze cleared.
How long is the growing season in Boyd?
Measured between 28°F hard freezes, Boyd sees about 158 frost-free days — roughly May 1 through Oct 6, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 22 to Sep 22, about 123 days.
Is the soil safe to grow vegetables in Boyd?
The federal record around Boyd is light — 42 documented sites across the 9 federal source types we checked, mostly Nitrate entries (24), the nearest Underground Storage Tanks record about 1.2 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 I protect my plants from frost in Boyd?
From about Sep 6 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 Oct 6 (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 Oct 6. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Boyd's scale — its 5a band and its 158-day season. Your yard writes its own version of Boyd'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 Boyd’s own scale
6 of the readings below were taken at Boyd's own scale — its own ~158-day season between 28°F freezes, the 176 acres it covers and 42 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Boyd's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Boyd's own 28°F hard-freeze dates, about May 1 and Oct 6 and the ~158-day span between themNOAA 1991–2020 Climate Normals
- 42 documented contamination sites on the federal record near Boyd, the closest Underground Storage Tanks record about 1.2 miles out from the town centreFederal environmental registers
- Boyd's boundary and the 176 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~158-day seasonGrowable Ground crop-matching engine
- The ecoregion at Boyd's own centroid, the Northwestern Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Boyd's 176 acres read through its county's SSURGO summaryfrom Carbon County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Carbon County
- The growing challenges every Montana grower plans around — written at state scale, so they stay on the state guidefrom Montana
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Carbon County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Boyd's 176 acreswhy one lot differs from the next →
- Which side of Boyd you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 176 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 1.2 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 Boyd-wide figureread your own land →
More in Montana
Wider growing context
What grows across MontanaBoyd sits outside our named growing regions, so Montana as a whole is its closest context here.