Millville, California, sits in USDA hardiness zone 9a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Expect artichoke, fig, california poppy, and cabbage to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Millville, 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 Millville 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 Millville — soil, climate, flood, and parcel records. How we handle your address.
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Millville — the short answer
Millville, California: USDA zone 9a, about 300 days between hard freezes, across 5K acres of town.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 12
- Shasta County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 9
- Shasta County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~300
- Shasta 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 Shasta County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Millville's average, not your lot's — a low corner or a tree line moves it. Against Millville's 300-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Millville
Each reading below is measured for Millville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsMillville runs about 300 days between hard freezes (read from Shasta County, the closest normal to Millville) — close to year-round growing.
Frost is rarely the limit here; winter plantings are as real as summer ones, and the harder question is which crops shrug off the summer heat.
Grow cool-season crops through the mild winter, and choose heat-tolerant varieties for the summer beds.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredMillville sits in USDA hardiness zone 9a.
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 Millville is in
Millville sits in the Central California Foothills and Coastal Mountains — EPA Level III, inside the wider Mediterranean California. That is read at Millville's own centroid, and it is not what its county reads: Shasta County is mostly Cascades. The wider page above you is answering a different question about different ground.
What Grows in Millville
Every plant below cleared Millville's own zone 9a and its 300-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Millville?
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 Jan 15; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 12 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 9 — long-season crops need about 90 days of runway, quick greens only 30. In a climate this gentle, “too late” hardly applies — the question becomes which crops prefer the cooler months ahead.
What's on the federal record near Millville
Closest first, within ~10 miles of Millville. Listing isn't leaking, and distance isn't exposure.
- TC BAR RANCHBrownfields · 0.7 mi
- 031N003W02M001MNitrate · 0.7 mi
- 031N003W09Q001MNitrate · 1.9 mi
- 031N003W22B001MNitrate · 1.9 mi
- 031N003W09F001MNitrate · 2.0 mi
- 031N003W13J001MNitrate · 2.0 mi
- 031N003W04F001MNitrate · 2.2 mi
- 031N003W16D001MNitrate · 2.3 mi
- BUD'S GARAGEBrownfields · 2.5 mi
- BELLA VISTA WATER DISTRICTPFAS · 2.9 mi
- 031N002W19B001MNitrate · 2.9 mi
- IN AND OUT MINI MARTBrownfields · 3.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Millville'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 Millville.
Total Sites
531
within ~10 miles of Millville
Risk Level
Elevated
Highest-severity
5 Toxics Release Inventory facilities
Sources Checked
within ~10 miles of Millville
Severity Distribution
within ~10 miles of Millville
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Millville, Brownfields runs higher than the national average — 364 sites within ~10 miles of Millville. That's not a problem with your land — it's information about it.
Brownfields: Brownfield sites are former commercial or industrial properties where legacy soil contamination (heavy metals, PAHs, petroleum compounds) may persist.
Check EPA brownfield remediation status — many sites have completed cleanup with institutional controls.
Check your specific parcel in Millville
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 Millville average
Your land is one point inside Millville
Everything above resolves to Millville as a whole — one PHZM band, read across 5K acres, with hard-freeze dates borrowed from Shasta 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 Millville Average
Millville Average
- ●USDA Zones 9a, averaged across Millville
- ●One soil character for all of Millville
- ●Frost dates read at Millville's scale: Feb 12 to Dec 9
YOUR Parcel
- ✓Your exact zone, not Millville's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Millville
Pull a site-specific report for your exact address in Millville, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Millville averages can't show:
We read public map data around Millville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Millville average
How we know this about Millville
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 Shasta 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 Millville
When does frost risk typically end in Millville?
The last hard freeze (28°F) in Millville typically lands around Feb 12, 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 Mar 5.
When is the first frost in Millville?
The first hard freeze (28°F) in Millville typically arrives around Dec 9, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 25, so the watching starts about Nov 9 — about 300 days after the spring freeze cleared.
How long is the growing season in Millville?
Measured between 28°F hard freezes, Millville sees about 300 frost-free days — roughly Feb 12 through Dec 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 5 to Nov 25, about 265 days.
Is the soil safe to grow vegetables in Millville?
The federal record around Millville is a meaningful one — 531 documented sites, mostly Brownfields entries (364), the nearest Brownfields record about 0.7 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 Millville?
From about Nov 9 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 Dec 9 (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 Dec 9. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Millville's scale — its 9a band and its 300-day season. Your yard writes its own version of Millville'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 Millville’s own scale
5 of the readings below were taken at Millville's own scale — the 5,149 acres it covers and 531 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Millville's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 531 documented contamination sites on the federal record near Millville, the closest Brownfields record about 0.7 miles out from the town centreFederal environmental registers
- Millville's boundary and the 5,149 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~300-day seasonGrowable Ground crop-matching engine
- Millville sits in the Central California Foothills and Coastal Mountains — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Millville has no normal of its own, so its county's is the closest measured readfrom Shasta County
- Soil character — no town-scale survey exists, so Millville's 5,149 acres read through its county's SSURGO summaryfrom Shasta County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Shasta 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 Shasta County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Millville's 5,149 acreswhy one lot differs from the next →
- Which side of Millville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 5,149 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.7 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 Millville-wide figureread your own land →
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