Placer County, in California, sits in USDA hardiness zone 8b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
On paper, cabbage, fig, california poppy, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Placer County lies within the Sierra Nevada Foothills — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Placer County holds more than one microclimate.
Soils and elevations shift across Placer County, so your frost dates and drainage aren't the county average. 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 Placer County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Placer County — the short answer
Placer County, California: USDA zone 8b, about 290 days between hard freezes, across 901K acres.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 23
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Dec 10
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~290
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 901K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 8b is Placer County's average, not your lot's — a low corner or a tree line moves it. Against Placer County's 290-day season, see what your own ground reads.
One county, several growing seasons
Placer County's hard-freeze record runs about 290 days between freezes — but that is the county-wide average, and several towns inside it carry a markedly different season in their own 30-year record: Carnelian Bay at about 140 days, Sunnyside-Tahoe City at 140 and Tahoe Vista at 140 (against the county's ~290).
Those are measured records, not estimates. If you garden in one of these pockets, plant against your own town's season rather than the county's ~290-day average.
NOAA Regional Climate Centers ACIS (1991–2020), 30-year daily minimum record. Only held-out towns carrying their own record are named — a town with no record of its own is absent rather than estimated, and a county with nothing qualifying shows no spread at all.
Heat and winter chill in Placer County
Across a year, Placer County accumulates about 3,536 growing degree days above 50°F, about 221 fewer than the middle California county — ahead of 22 of California’s 57 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Winter banks about 1,813 hours below 45°F, 626 more than the California middle of 1,187. Chill is what tells a fruit tree its dormancy is over, and it is set by climate rather than by anything you can build.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Placer County
Across Placer County, the ground is predominantly Inceptisols, where McCarthy, Waca, and Deadwood are the most extensive named soil series. The soil is generally well drained with a gravelly sandy loam surface. Topsoil pH runs about 5.8–6.1, moderately acidic. Rainfall drains through hydrologic group B soils.
Soil order
Inceptisols
Drainage
Well drained
Hydric soils
1%
Soil still varies lot by lot — soil types explained.
How the ground varies across Placer County
The USDA soil survey maps 67% of Placer County as well drained — but another 24% drains differently: 13% somewhat excessively drained, 6% excessively drained.
McCarthy is the most extensive named soil at 7% of mapped acres, then Waca (6%) and Deadwood (5%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Placer County
Each reading below is measured for Placer County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Placer County are well drained, in hydrologic group B — ground that drains quickly.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Placer County runs about pH 5.8–6.1, on the acidic side.
Blueberries, potatoes, and rhododendrons thrive in it, but most vegetables start locking out nutrients below about pH 6.0 and grow pale and stunted no matter how much you feed them.
A measured lime application raises pH for the crops that need it — but test first, because the right rate depends on your own soil, not the county average.
USDA NRCS SSURGO
Season length
MeasuredPlacer County runs about 290 days between hard freezes — 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
MeasuredPlacer County 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 Placer County is in
Placer County spans 3 EPA Level III ecoregions — Sierra Nevada (70%), Central California Foothills and Coastal Mountains (17%) and Central California Valley (13%). Which one your land falls in changes what grows wild there and how the ground behaves, and a county-wide answer cannot tell you which.
What Grows in Placer County
We scored all 1,086 plants against Placer County's own USDA zone 8b and its own 290-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's California profile.
Is it too late to plant in Placer County?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Jan 26; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 23 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 10 — long-season crops need about 90 days of runway, quick greens only 30. Here the calendar nearly circles: cool-season crops take the winter shift, and the next window is always close.
Documented around Placer County
- monarch butterfly12 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Placer County
USGS estimates 13,234 lb of Glyphosate on Placer County farmland in 2019, its largest by weight, ahead of Thiobencarb (2,455 lb) and Triclopyr (1,198 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Placer County — and how to grow with it.
We checked the federal record across Placer County — 2,311 documented sites across 7 of the 9 source types we track.
The most significant on record: 4 Superfund sites (none NPL-listed). Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
Placer County carries one of the heavier federal records we track — and that's not a verdict on your yard. Proximity to a documented site is information, not a diagnosis: nothing here says any particular parcel is affected. It does earn one concrete step — before food beds go in the ground, a professional soil test tells you exactly what you're working with, and raised beds with clean imported soil grow well almost anywhere in the meantime.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Placer County
Closest first, across Placer County. Listing isn't leaking, and distance isn't exposure.
- 014N011E15L001MNitrate · 0.6 mi
- UnknownMining · 0.6 mi
- Schermeir ProspectMining · 1.5 mi
- SchermeirMining · 1.5 mi
- Southern Pacific PropertyMining · 1.5 mi
- Southern PacificMining · 1.5 mi
- Michigan Bluff DistrictMining · 1.6 mi
- Fitzgerald and Russell LeaseMining · 1.7 mi
- FORESTHILL PUBLIC UTILITY DISTPFAS · 1.7 mi
- Bear Wallow ProspectMining · 2.0 mi
- Bear WallowMining · 2.0 mi
- Jennie OccurranceMining · 2.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Placer County'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 Placer County.
Total Sites
2,311
across Placer County
Risk Level
High
Highest-severity
4 Superfund sites (none NPL-listed)
Sources Checked
across Placer County
Severity Distribution
across Placer County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Placer County, two things run higher than the national average across Placer County — Mining (316 sites) and Brownfields (1,648 sites). That's not a problem with your land — it's information about it.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Brownfields: Brownfield sites are former commercial or industrial properties where legacy soil contamination (heavy metals, PAHs, petroleum compounds) may persist.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check EPA brownfield remediation status — many sites have completed cleanup with institutional controls.
Check your specific parcel in Placer County
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 Placer County average
Your land is one point inside Placer County
Everything above resolves to Placer County as a whole — one PHZM band and one county frost record, read across 901K 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 county 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 county average.
Your Lot vs the Placer County Average
Placer County Average
- ●USDA Zones 8b, averaged across Placer County
- ●One soil character for all of Placer County
- ●Frost dates read at Placer County's scale: Feb 23 to Dec 10
YOUR Parcel
- ✓Your exact zone, not Placer County's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Placer County
Pull a site-specific report for your exact address in Placer County, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Placer County averages can't show:
We read public map data around Placer County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Placer County average
How we know this about Placer County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Placer County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Placer County
When does frost risk typically end in Placer County?
The last hard freeze (28°F) in Placer County typically lands around Feb 23, 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 16.
How long is the growing season in Placer County?
Measured between 28°F hard freezes, Placer County sees about 290 frost-free days — roughly Feb 23 through Dec 10, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 16 to Nov 26, about 255 days.
Is the soil safe to grow vegetables in Placer County?
The federal record around Placer County runs heavier than most — 2,311 documented sites, mostly Brownfields entries (1,648), the nearest Nitrate record about 0.6 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.
Everything above is measured at Placer County's scale — its 8b band and its 290-day season. Your yard writes its own version of Placer County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads California's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Placer County’s own scale
9 of the readings below were taken at Placer County's own scale — its own ~290-day span between 28°F freezes, the 3 most extensive soil series mapped here and 2,311 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Placer County's own USDA hardiness band, zones 8bUSDA PHZM 2023
- Placer County's own 28°F hard-freeze dates and its ~290-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Placer CountyUSDA NRCS SSURGO
- 2,311 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Nitrate record about 0.6 miles outFederal environmental registers
- Placer County's boundary and the 900,736 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~290-day seasonGrowable Ground crop-matching engine
- The 3 ecoregions Placer County spans, Sierra Nevada the largestUS EPA Level III Ecoregions
- Open occurrence records documented in Placer County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Placer County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every California grower plans around — written at state scale, so they stay on the state guidefrom California
What this page can’t tell you
- How the season shifts across Placer County — the ~290 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Placer County's 900,736 acreswhy one lot differs from the next →
- Which of those 2,311 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Placer Countyread your own land →