Ripon, California, sits in USDA hardiness zone 9b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include okra, meyer lemon, california poppy, and artichoke; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Ripon, 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 Ripon 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 Ripon — soil, climate, flood, and parcel records. How we handle your address.
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Ripon — the short answer
Ripon, California: USDA zone 9b, about 321 days between hard freezes, across 3K acres of city.
- USDA zone
- 9b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 24
- San Joaquin County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 11
- San Joaquin County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~321
- San Joaquin County normal — NOAA 1991–2020, nearest to this town
- City area
- 3K 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 Joaquin County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9b is Ripon's average, not your lot's — a low corner or a tree line moves it. Against Ripon's 321-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Ripon
Each reading below is measured for Ripon itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsRipon runs about 321 days between hard freezes (read from San Joaquin County, the closest normal to Ripon) — 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
MeasuredRipon 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 Ripon is in
Ripon sits in the Central California Valley — EPA Level III, inside the wider Mediterranean California. That is read at Ripon's own centroid rather than borrowed from San Joaquin County.
What Grows in Ripon
Every plant below cleared Ripon's own zone 9b and its 321-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Ripon?
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 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Jan 24 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 11 — 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 Ripon
Closest first, within ~10 miles of Ripon. Listing isn't leaking, and distance isn't exposure.
- RIPON UNIFIED SCHOOL DISTRICTBrownfields · 600 ft
- RIPON CHRISTIAN SCHOOLSBrownfields · 600 ft
- RIPON UNIFIED SCHOOL DISTICT--OPERATIONSBrownfields · 950 ft
- DRS DUTTER, HUFFORD & DALEY DBA RIPON FAMILY PHYSICIANSBrownfields · 1300 ft
- RIPON POLICE DEPT/ CITY OF RIPONBrownfields · 1500 ft
- DOLLAR TREE #07648Brownfields · 1500 ft
- RIPON CLEANERSBrownfields · 1500 ft
- BETHANY HOME SOCIETY OF SAN JOAQUIN CNTYBrownfields · 1700 ft
- SHOCKEY & SONS TRUCKINGBrownfields · 1700 ft
- NESTLE USA, INCBrownfields · 1700 ft
- N & S IRRIGATIONBrownfields · 1800 ft
- TANA HENDERSON DDSBrownfields · 1800 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Ripon'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 Ripon.
Sources Checked
within ~10 miles of Ripon
Severity Distribution
within ~10 miles of Ripon
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Ripon, Brownfields runs higher than the national average — 1,339 sites within ~10 miles of Ripon. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around 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 Ripon
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 Ripon average
Your land is one point inside Ripon
Everything above resolves to Ripon as a whole — one PHZM band, read across 3K acres, with hard-freeze dates borrowed from San Joaquin County’s record because no 30-year normal resolves at this city’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 city 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 Ripon Average
Ripon Average
- ●USDA Zones 9b, averaged across Ripon
- ●One soil character for all of Ripon
- ●Frost dates read at Ripon's scale: Jan 24 to Dec 11
YOUR Parcel
- ✓Your exact zone, not Ripon's 9b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Ripon
Pull a site-specific report for your exact address in Ripon, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Ripon averages can't show:
We read public map data around Ripon — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Ripon average
How we know this about Ripon
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at San Joaquin 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 city grain anywhere on this page — there is no city-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 Ripon
When does frost risk typically end in Ripon?
The last hard freeze (28°F) in Ripon typically lands around Jan 24, 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 14.
When is the first frost in Ripon?
The first hard freeze (28°F) in Ripon typically arrives around Dec 11, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 27, so the watching starts about Nov 11 — about 321 days after the spring freeze cleared.
How long is the growing season in Ripon?
Measured between 28°F hard freezes, Ripon sees about 321 frost-free days — roughly Jan 24 through Dec 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 14 to Nov 27, about 286 days.
Is the soil safe to grow vegetables in Ripon?
The federal record around Ripon is a meaningful one — 1,879 documented sites, mostly Brownfields entries (1,339), the nearest Brownfields record about 0.1 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 Ripon?
From about Nov 11 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 11 (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 11. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Ripon's scale — its 9b band and its 321-day season. Your yard writes its own version of Ripon'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 Ripon’s own scale
5 of the readings below were taken at Ripon's own scale — the 3,421 acres it covers and 1,879 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Ripon's own USDA hardiness band, zones 9bUSDA PHZM 2023
- 1,879 documented contamination sites on the federal record near Ripon, the closest Brownfields record about 0.1 miles out from the town centreFederal environmental registers
- Ripon's boundary and the 3,421 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9b and a ~321-day seasonGrowable Ground crop-matching engine
- The ecoregion at Ripon's own centroid, the Central California ValleyUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Ripon has no normal of its own, so its county's is the closest measured readfrom San Joaquin County
- Soil character — no town-scale survey exists, so Ripon's 3,421 acres read through its county's SSURGO summaryfrom San Joaquin County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom San Joaquin 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 Joaquin County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Ripon's 3,421 acreswhy one lot differs from the next →
- Which side of Ripon you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,421 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.1 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 Ripon-wide figureread your own land →
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