Granby, Missouri, sits in USDA hardiness zone 7a — 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, hazelnut, california poppy, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Granby, 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 Granby 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 Granby — soil, climate, flood, and parcel records. How we handle your address.
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Granby — the short answer
Granby, Missouri: USDA zone 7a, about 219 days between hard freezes, across 3K acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~219
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 3K 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 7a is Granby's average, not your lot's — a low corner or a tree line moves it. Against Granby's 219-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Granby
Each reading below is measured for Granby itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredGranby runs about 219 days between hard freezes — 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
MeasuredGranby sits in USDA hardiness zone 7a.
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 Granby is in
Granby sits in the Ozark Highlands — EPA Level III, inside the wider Eastern Temperate Forests. That is read at Granby's own centroid rather than borrowed from Newton County.
What Grows in Granby
Every plant below cleared Granby's own zone 7a and its 219-day season. Each card opens that plant's Missouri profile. How we score.
Is it too late to plant in Granby?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 2; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 30 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 4 — 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 Granby
Closest first, within ~10 miles of Granby. Listing isn't leaking, and distance isn't exposure.
- Granby Ore Block 100Mining · 750 ft
- Granby Ore Block 103Mining · 800 ft
- Dutch Hollow DiggingsMining · 1000 ft
- Granby Ore Block 99Mining · 1100 ft
- CLOSED GASOLINE SERVICE STATIONUnderground Storage Tanks · 1400 ft
- Brock Hollow DiggingsMining · 1500 ft
- Pike MineMining · 1600 ft
- Granby Ore Block 97Mining · 1600 ft
- SNAK ATAK #8Underground Storage Tanks · 1600 ft
- Granby Ore Block 104Mining · 1700 ft
- MHTDUnderground Storage Tanks · 1700 ft
- J. Brackeen MineMining · 1800 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Granby'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 Granby.
Sources Checked
within ~10 miles of Granby
Severity Distribution
within ~10 miles of Granby
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Granby, two things run higher than the national average within ~10 miles of Granby — Mining (400 sites) and CAFO (26 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Check your specific parcel in Granby
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 Granby average
Your land is one point inside Granby
Everything above resolves to Granby as a whole — one PHZM band and one 28°F frost record, read across 3K 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 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 Granby Average
Granby Average
- ●USDA Zones 7a, averaged across Granby
- ●One soil character for all of Granby
- ●Frost dates read at Granby's scale: Mar 30 to Nov 4
YOUR Parcel
- ✓Your exact zone, not Granby's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Granby
Pull a site-specific report for your exact address in Granby, Missouri — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Granby averages can't show:
We read public map data around Granby — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Granby average
How we know this about Granby
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 Granby’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 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 Granby
When does frost risk typically end in Granby?
The last hard freeze (28°F) in Granby typically lands around Mar 30, 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 20.
When is the first frost in Granby?
The first hard freeze (28°F) in Granby typically arrives around Nov 4, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 21, so the watching starts about Oct 5 — about 219 days after the spring freeze cleared.
How long is the growing season in Granby?
Measured between 28°F hard freezes, Granby sees about 219 frost-free days — roughly Mar 30 through Nov 4, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 20 to Oct 21, about 184 days.
Is the soil safe to grow vegetables in Granby?
The federal record around Granby runs heavier than most — 607 documented sites, mostly Mining entries (400), the nearest Mining record about 0.1 miles out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Granby?
From about Oct 5 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 4 (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 4. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Granby's scale — its 7a band and its 219-day season. Your yard writes its own version of Granby'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 Granby’s own scale
6 of the readings below were taken at Granby's own scale — its own ~219-day season between 28°F freezes, the 2,831 acres it covers and 607 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Granby's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Granby's own 28°F hard-freeze dates, about Mar 30 and Nov 4 and the ~219-day span between themNOAA 1991–2020 Climate Normals
- 607 documented contamination sites on the federal record near Granby, the closest Mining record about 0.1 miles out from the town centreFederal environmental registers
- Granby's boundary and the 2,831 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~219-day seasonGrowable Ground crop-matching engine
- The ecoregion at Granby's own centroid, the Ozark HighlandsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Granby's 2,831 acres read through its county's SSURGO summaryfrom Newton County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Newton County
- The growing challenges every Missouri grower plans around — written at state scale, so they stay on the state guidefrom Missouri
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Newton County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Granby's 2,831 acreswhy one lot differs from the next →
- Which side of Granby you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,831 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Mining record about 0.1 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 Granby-wide figureread your own land →
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