Shandon, California, sits in USDA hardiness zone 9a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
On paper, tomato, artichoke, fig, and california poppy all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Shandon, 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 Shandon 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 Shandon — soil, climate, flood, and parcel records. How we handle your address.
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Shandon — the short answer
Shandon, California: USDA zone 9a, about 228 days between hard freezes, across 2K acres of town.
- USDA zone
- 9a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 1
- San Luis Obispo County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Nov 15
- San Luis Obispo County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~228
- San Luis Obispo 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 San Luis Obispo County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9a is Shandon's average, not your lot's — a low corner or a tree line moves it. Against Shandon's 228-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Shandon
Each reading below is measured for Shandon itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsShandon runs about 228 days between hard freezes (read from San Luis Obispo County, the closest normal to Shandon) — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredShandon 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 Shandon is in
Shandon sits in the Central California Foothills and Coastal Mountains — EPA Level III, inside the wider Mediterranean California. That is read at Shandon's own centroid rather than borrowed from San Luis Obispo County.
What Grows in Shandon
Plants matched to Shandon'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 Shandon?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Mar 4; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 15 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
What's on the federal record near Shandon
Closest first, within ~10 miles of Shandon. Listing isn't leaking, and distance isn't exposure.
- SUNVIEW SHANDONBrownfields · 1700 ft
- SHANDON USD SHANDON HIGH SCHBrownfields · 1700 ft
- ABATE MACHINERYBrownfields · 1900 ft
- FALLING STAR HOMES INC DBA ARCIERO FARMS INCBrownfields · 0.7 mi
- WESTERN CRANE AND DIESEL INCBrownfields · 0.9 mi
- SVP WINERY VINEYARDSBrownfields · 1.2 mi
- OCEANO PACKING COMPANY LLCBrownfields · 1.2 mi
- 026S015E28B001MNitrate · 1.4 mi
- CENTRAL COAST FARMSBrownfields · 1.4 mi
- ASELLUS - PASO ROBLES LLC DBA SLO CLARK HOME RANCHBrownfields · 2.0 mi
- SVP WINERYBrownfields · 2.0 mi
- 026S015E10P002MNitrate · 2.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Shandon'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 Shandon.
Severity Distribution
within ~10 miles of Shandon
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Shandon, two things run higher than the national average within ~10 miles of Shandon — Nitrate (14 sites) and Brownfields (25 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Brownfields: Brownfield sites are former commercial or industrial properties where legacy soil contamination (heavy metals, PAHs, petroleum compounds) may persist.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check EPA brownfield remediation status — many sites have completed cleanup with institutional controls.
Check your specific parcel in Shandon
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 Shandon average
Your land is one point inside Shandon
Everything above resolves to Shandon as a whole — one PHZM band, read across 2K acres, with hard-freeze dates borrowed from San Luis Obispo 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 Shandon Average
Shandon Average
- ●USDA Zones 9a, averaged across Shandon
- ●One soil character for all of Shandon
- ●Frost dates read at Shandon's scale: Apr 1 to Nov 15
YOUR Parcel
- ✓Your exact zone, not Shandon's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Shandon
Pull a site-specific report for your exact address in Shandon, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Shandon averages can't show:
We read public map data around Shandon — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Shandon average
How we know this about Shandon
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 San Luis Obispo 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 Shandon
When does frost risk typically end in Shandon?
The last hard freeze (28°F) in Shandon typically lands around Apr 1, 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 Apr 22.
When is the first frost in Shandon?
The first hard freeze (28°F) in Shandon typically arrives around Nov 15, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 1, so the watching starts about Oct 16 — about 228 days after the spring freeze cleared.
How long is the growing season in Shandon?
Measured between 28°F hard freezes, Shandon sees about 228 frost-free days — roughly Apr 1 through Nov 15, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 22 to Nov 1, about 193 days.
Is the soil safe to grow vegetables in Shandon?
The federal record around Shandon is light — 39 documented sites across the 9 federal source types we checked, mostly Brownfields entries (25), the nearest Brownfields record about 0.3 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Shandon?
From about Oct 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 Nov 15 (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 Nov 15. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Shandon's scale — its 9a band and its 228-day season. Your yard writes its own version of Shandon'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 Shandon’s own scale
4 of the readings below were taken at Shandon's own scale — the 1,888 acres it covers and 39 documented sites around it; 6 are borrowed from a wider read, named and linked below.
Measured here
- Shandon's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 39 documented contamination sites on the federal record near Shandon, the closest Brownfields record about 0.3 miles out from the town centreFederal environmental registers
- Shandon's boundary and the 1,888 acres inside itUS Census TIGER/Line 2025
- The ecoregion at Shandon'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 — Shandon has no normal of its own, so its county's is the closest measured readfrom San Luis Obispo County
- Soil character — no town-scale survey exists, so Shandon's 1,888 acres read through its county's SSURGO summaryfrom San Luis Obispo 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 San Luis Obispo 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 San Luis Obispo County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Shandon's 1,888 acreswhy one lot differs from the next →
- Which side of Shandon you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,888 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 Shandon-wide figureread your own land →