Mount Hebron, California, sits in USDA hardiness zone 6b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
On paper, cabbage, blackberry, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Mount Hebron, 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 Mount Hebron 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 Mount Hebron — soil, climate, flood, and parcel records. How we handle your address.
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Mount Hebron — the short answer
Mount Hebron, California: USDA zone 6b, about 129 days between hard freezes, across 480 acres of town.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~129
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 480 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 6b is Mount Hebron's average, not your lot's — a low corner or a tree line moves it. Against Mount Hebron's 129-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Mount Hebron
Each reading below is measured for Mount Hebron itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredMount Hebron runs about 129 days between hard freezes — 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
MeasuredMount Hebron sits in USDA hardiness zone 6b.
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 Mount Hebron is in
Mount Hebron sits in the Eastern Cascades Slopes and Foothills — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Mount Hebron's own centroid, and it is not what its county reads: Siskiyou County is mostly Klamath Mountains/California High North Coast Range. The wider page above you is answering a different question about different ground.
What Grows in Mount Hebron
Every plant below cleared Mount Hebron's own zone 6b and its 129-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Mount Hebron?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Apr 29; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 27 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 3 — 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 Mount Hebron
Closest first, within ~10 miles of Mount Hebron. Listing isn't leaking, and distance isn't exposure.
- 046N001W32K002MNitrate · 650 ft
- USDA USFS R05 SHASTA-TRINITY NF MT. SHASTA RANGER DISTRICTBrownfields · 1000 ft
- MT. HEBRON WORK CENTERSuperfund · 1100 ft
- NORCAL NURSERY, INC (MACDOEL RANCH)Brownfields · 2.1 mi
- SIERRA CASCADE NURSERYBrownfields · 2.2 mi
- CUSTOM CRUSHING INDUSTRIES INCBrownfields · 2.9 mi
- AT&T MOBILITYBrownfields · 2.9 mi
- PLANT SCIENCES INCBrownfields · 2.9 mi
- Macdoel ShellUnderground Storage Tanks · 2.9 mi
- 046N001W17G002MNitrate · 2.9 mi
- GENCORToxics Release Inventory · 4.7 mi
Measured from Mount Hebron'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 Mount Hebron.
Total Sites
13
within ~10 miles of Mount Hebron
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Mount Hebron
Severity Distribution
within ~10 miles of Mount Hebron
Highest-Severity Sites
Know Before You Grow
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
- •A Superfund listing means federally documented contamination. Test soil and water before planting edibles nearby.
Check your specific parcel in Mount Hebron
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 Mount Hebron average
Your land is one point inside Mount Hebron
Everything above resolves to Mount Hebron as a whole — one PHZM band and one 28°F frost record, read across 480 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 Mount Hebron Average
Mount Hebron Average
- ●USDA Zones 6b, averaged across Mount Hebron
- ●One soil character for all of Mount Hebron
- ●Frost dates read at Mount Hebron's scale: May 27 to Oct 3
YOUR Parcel
- ✓Your exact zone, not Mount Hebron's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Mount Hebron
Pull a site-specific report for your exact address in Mount Hebron, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Mount Hebron averages can't show:
We read public map data around Mount Hebron — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Mount Hebron average
How we know this about Mount Hebron
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 Mount Hebron’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 Mount Hebron
When does frost risk typically end in Mount Hebron?
The last hard freeze (28°F) in Mount Hebron typically lands around May 27, 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 17.
When is the first frost in Mount Hebron?
The first hard freeze (28°F) in Mount Hebron typically arrives around Oct 3, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 19, so the watching starts about Sep 3 — about 129 days after the spring freeze cleared.
How long is the growing season in Mount Hebron?
Measured between 28°F hard freezes, Mount Hebron sees about 129 frost-free days — roughly May 27 through Oct 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 17 to Sep 19, about 94 days.
Is the soil safe to grow vegetables in Mount Hebron?
The federal record around Mount Hebron is a meaningful one — 13 documented sites, mostly Brownfields entries (6), the nearest Nitrate record about 0.1 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 gardeners stretch the season in Mount Hebron?
With about 129 frost-free days between hard freezes, Mount Hebron 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 157 to 185 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 27 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Mount Hebron's scale — its 6b band and its 129-day season. Your yard writes its own version of Mount Hebron'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 Mount Hebron’s own scale
6 of the readings below were taken at Mount Hebron's own scale — its own ~129-day season between 28°F freezes, the 480 acres it covers and 13 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Mount Hebron's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Mount Hebron's own 28°F hard-freeze dates, about May 27 and Oct 3 and the ~129-day span between themNOAA 1991–2020 Climate Normals
- 13 documented contamination sites on the federal record near Mount Hebron, the closest Nitrate record about 0.1 miles out from the town centreFederal environmental registers
- Mount Hebron's boundary and the 480 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~129-day seasonGrowable Ground crop-matching engine
- Mount Hebron sits in the Eastern Cascades Slopes and Foothills — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Mount Hebron's 480 acres read through its county's SSURGO summaryfrom Siskiyou County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Siskiyou County
- The growing challenges every California grower plans around — written at state scale, so they stay on the state guidefrom California
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Siskiyou County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Mount Hebron's 480 acreswhy one lot differs from the next →
- Which side of Mount Hebron you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 480 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate 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 Mount Hebron-wide figureread your own land →
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