Happy Valley, California, sits in USDA hardiness zone 9b — 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: tomato, artichoke, fig, and california poppy. The site-level story — soil, sun, drainage — decides the rest.
Even in Happy Valley, 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 Happy Valley 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 Happy Valley — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Happy Valley — the short answer
Happy Valley, California: USDA zone 9b, about 300 days between hard freezes, across 11K acres of town.
- USDA zone
- 9b
- 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
- 11K 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 9b is Happy Valley's average, not your lot's — a low corner or a tree line moves it. Against Happy Valley's 300-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Happy Valley
Each reading below is measured for Happy Valley itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsHappy Valley runs about 300 days between hard freezes (read from Shasta County, the closest normal to Happy Valley) — 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
MeasuredHappy Valley sits in USDA hardiness zone 9b.
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 Happy Valley is in
Happy Valley sits in the Central California Foothills and Coastal Mountains — EPA Level III, inside the wider Mediterranean California. That is read at Happy Valley'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 Happy Valley
Plants matched to Happy Valley's USDA zones 9b, 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 Happy Valley?
Usually not — gardeners here simply switch what goes in the ground as the season moves. 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. 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 Happy Valley
Closest first, within ~10 miles of Happy Valley. Listing isn't leaking, and distance isn't exposure.
- 030N005W10L001MNitrate · 250 ft
- 030N005W11N001MNitrate · 0.9 mi
- MARTON'S REPAIRBrownfields · 1.1 mi
- Happy Valley MarketUnderground Storage Tanks · 1.3 mi
- HAPPY VALLEY MARKET INCBrownfields · 1.4 mi
- HAPPY VALLEY FIRE PROTECTION DISTRICTBrownfields · 1.4 mi
- SHASTA COUNTY DEPT OF RESOURCE MGMTBrownfields · 1.4 mi
- 030N005W11R002MNitrate · 1.6 mi
- 030N005W02J001MNitrate · 1.8 mi
- COUNTRY MARKETUnderground Storage Tanks · 2.0 mi
- MODERN PLUMBING COBrownfields · 2.0 mi
- 030N005W23B001MNitrate · 2.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Happy Valley'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 Happy Valley.
Total Sites
1,028
within ~10 miles of Happy Valley
Risk Level
Elevated
Highest-severity
3 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Happy Valley
Severity Distribution
within ~10 miles of Happy Valley
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Happy Valley, Brownfields runs higher than the national average — 746 sites within ~10 miles of Happy Valley. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
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 Happy Valley
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 Happy Valley average
Your land is one point inside Happy Valley
Everything above resolves to Happy Valley as a whole — one PHZM band, read across 11K 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 Happy Valley Average
Happy Valley Average
- ●USDA Zones 9b, averaged across Happy Valley
- ●One soil character for all of Happy Valley
- ●Frost dates read at Happy Valley's scale: Feb 12 to Dec 9
YOUR Parcel
- ✓Your exact zone, not Happy Valley's 9b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Happy Valley
Pull a site-specific report for your exact address in Happy Valley, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Happy Valley averages can't show:
We read public map data around Happy Valley — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Happy Valley average
How we know this about Happy Valley
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 Happy Valley
When does frost risk typically end in Happy Valley?
The last hard freeze (28°F) in Happy Valley 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 Happy Valley?
The first hard freeze (28°F) in Happy Valley 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 Happy Valley?
Measured between 28°F hard freezes, Happy Valley 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 Happy Valley?
The federal record around Happy Valley is a meaningful one — 1,028 documented sites, mostly Brownfields entries (746), the nearest Nitrate record under a tenth of a mile 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 Happy Valley?
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 Happy Valley's scale — its 9b band and its 300-day season. Your yard writes its own version of Happy Valley'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 Happy Valley’s own scale
4 of the readings below were taken at Happy Valley's own scale — the 10,810 acres it covers and 1,028 documented sites around it; 6 are borrowed from a wider read, named and linked below.
Measured here
- Happy Valley's own USDA hardiness band, zones 9bUSDA PHZM 2023
- 1,028 documented contamination sites on the federal record near Happy Valley, the closest Nitrate record under a tenth of a mile out from the town centreFederal environmental registers
- Happy Valley's boundary and the 10,810 acres inside itUS Census TIGER/Line 2025
- Happy Valley 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 — Happy Valley 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 Happy Valley's 10,810 acres read through its county's SSURGO summaryfrom Shasta 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 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 Happy Valley's 10,810 acreswhy one lot differs from the next →
- Which side of Happy Valley you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 10,810 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record under a tenth of a mile 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 Happy Valley-wide figureread your own land →
More in California
Growing region
Nearby growing guides