Moskowite Corner, California, sits in USDA hardiness zone 9a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Growers here do well with tomato, artichoke, fig, and california poppy — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Moskowite Corner, 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 Moskowite Corner 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 Moskowite Corner — soil, climate, flood, and parcel records. How we handle your address.
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Moskowite Corner — the short answer
Moskowite Corner, California: USDA zone 9a, about 327 days between hard freezes, across 2K acres of town.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 23
- Napa County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 16
- Napa County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~327
- Napa County normal — NOAA 1991–2020, nearest to this town
- Town area
- 2K 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 Napa County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Moskowite Corner's average, not your lot's — a low corner or a tree line moves it. Against Moskowite Corner's 327-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Moskowite Corner
Each reading below is measured for Moskowite Corner itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsMoskowite Corner runs about 327 days between hard freezes (read from Napa County, the closest normal to Moskowite Corner) — 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
MeasuredMoskowite Corner 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 Moskowite Corner is in
Moskowite Corner sits in the Central California Foothills and Coastal Mountains — EPA Level III, inside the wider Mediterranean California. That is read at Moskowite Corner's own centroid rather than borrowed from Napa County.
What Grows in Moskowite Corner
Plants matched to Moskowite Corner's USDA zones 9a, ordered by how much hardiness margin each has here — the ones with room to spare at both ends of this town's band lead. Each links to its full growing profile.
Is it too late to plant in Moskowite Corner?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Jan 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Jan 23 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 16 — long-season crops need about 90 days of runway, quick greens only 30. And with a calendar this mild, the honest answer is that planting barely stops — winter opens seasons colder regions never see.
What's on the federal record near Moskowite Corner
Closest first, within ~10 miles of Moskowite Corner. Listing isn't leaking, and distance isn't exposure.
- NAPA COUNTY - ENVIRONMENTAL MGMTBrownfields · 1800 ft
- CAPELL VALLEY ESTATESBrownfields · 1900 ft
- PLEASURE COVE MARINABrownfields · 2.2 mi
- CALTRANS DIST 4Brownfields · 2.2 mi
- Unnamed LocationMining · 2.6 mi
- UnknownMining · 2.9 mi
- NEW CINGULAR WIRELESS PCS LLCBrownfields · 3.3 mi
- Unnamed ProspectMining · 3.4 mi
- BERRYESSA SMI OPCO LPBrownfields · 3.8 mi
- NAPA COUNTY DEPT OF ENVIRON MNGMNTBrownfields · 4.4 mi
- 006N003W06P001MNitrate · 4.5 mi
- MARKLEY COVE RESORTBrownfields · 4.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Moskowite Corner'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 Moskowite Corner.
Total Sites
147
within ~10 miles of Moskowite Corner
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Moskowite Corner
Severity Distribution
within ~10 miles of Moskowite Corner
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Moskowite Corner, two things run higher than the national average within ~10 miles of Moskowite Corner — Mining (16 sites) and Brownfields (95 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.
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 Moskowite Corner
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 Moskowite Corner average
Your land is one point inside Moskowite Corner
Everything above resolves to Moskowite Corner as a whole — one PHZM band, read across 2K acres, with hard-freeze dates borrowed from Napa 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 Moskowite Corner Average
Moskowite Corner Average
- ●USDA Zones 9a, averaged across Moskowite Corner
- ●One soil character for all of Moskowite Corner
- ●Frost dates read at Moskowite Corner's scale: Jan 23 to Dec 16
YOUR Parcel
- ✓Your exact zone, not Moskowite Corner's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Moskowite Corner
Pull a site-specific report for your exact address in Moskowite Corner, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Moskowite Corner averages can't show:
We read public map data around Moskowite Corner — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Moskowite Corner average
How we know this about Moskowite Corner
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 Napa 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 Moskowite Corner
When does frost risk typically end in Moskowite Corner?
The last hard freeze (28°F) in Moskowite Corner typically lands around Jan 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 Feb 13.
When is the first frost in Moskowite Corner?
The first hard freeze (28°F) in Moskowite Corner typically arrives around Dec 16, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Dec 2, so the watching starts about Nov 16 — about 327 days after the spring freeze cleared.
How long is the growing season in Moskowite Corner?
Measured between 28°F hard freezes, Moskowite Corner sees about 327 frost-free days — roughly Jan 23 through Dec 16, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 13 to Dec 2, about 292 days.
Is the soil safe to grow vegetables in Moskowite Corner?
The federal record around Moskowite Corner is a meaningful one — 147 documented sites, mostly Brownfields entries (95), the nearest Brownfields record about 0.3 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 Moskowite Corner?
From about Nov 16 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 16 (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 16. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Moskowite Corner's scale — its 9a band and its 327-day season. Your yard writes its own version of Moskowite Corner'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 Moskowite Corner’s own scale
4 of the readings below were taken at Moskowite Corner's own scale — the 1,814 acres it covers and 147 documented sites around it; 6 are borrowed from a wider read, named and linked below.
Measured here
- Moskowite Corner's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 147 documented contamination sites on the federal record near Moskowite Corner, the closest Brownfields record about 0.3 miles out from the town centreFederal environmental registers
- Moskowite Corner's boundary and the 1,814 acres inside itUS Census TIGER/Line 2025
- The ecoregion at Moskowite Corner's own centroid, the Central California Foothills and Coastal MountainsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Moskowite Corner has no normal of its own, so its county's is the closest measured readfrom Napa County
- Soil character — no town-scale survey exists, so Moskowite Corner's 1,814 acres read through its county's SSURGO summaryfrom Napa County
- The candidate plant list — California's curated set, filtered to this zone band and re-ordered by how much margin each has herefrom California
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Napa 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 Napa County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Moskowite Corner's 1,814 acreswhy one lot differs from the next →
- Which side of Moskowite Corner you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,814 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.3 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 Moskowite Corner-wide figureread your own land →
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