Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for 95645 — Knights Landing, CA

ZIP code 95645 (Knights Landing, Yolo County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F. The median last spring frost is February 7 and the first fall frost December 5.

Where ZIP 95645 is

Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone9b25 to 30 °F
Coldest night−3.9 to −1.1 °C
Last frostFeb 7
First frostDec 5
2012 zone9b

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 9b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Knights Landing, CA…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in Knights Landing, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostFebruary 7median — 50% chance of a later frost
Safe for tender plantsMarch 11only 10% chance of frost after
First fall frostDecember 5median — 10% chance by Nov 19
Growing season301 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 10 and returns around December 18.

From the NOAA station Woodland 1 Wnw, CA — 14 miles away, elevation 66 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 95645

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Dec 27 – Jan 10
SpinachSow outdoors · Dec 27 – Jan 17
Broccoli, cabbageStart indoors · Nov 29 – Dec 13
Broccoli, cabbageTransplant · Jan 17 – Jan 31
Onion setsPlant outdoors · Jan 10 – Jan 24
PotatoesPlant outdoors · Jan 17 – Jan 31
LettuceSow outdoors · Jan 10 – Jan 24
Carrots, beetsSow outdoors · Jan 17 – Jan 31
TomatoesStart indoors · Dec 13 – Dec 27
TomatoesTransplant · Feb 14 – Feb 28
Peppers, eggplantStart indoors · Nov 29 – Dec 13
Peppers, eggplantTransplant · Feb 21 – Mar 7
BeansSow outdoors · Feb 14 – Feb 28
Sweet cornSow outdoors · Feb 14 – Feb 28
Cucumbers, squashSow outdoors · Feb 14 – Feb 28
Fall lettuce, spinachSow outdoors · Oct 10 – Oct 24
GarlicPlant cloves · Nov 21 – Dec 26
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 7) and first fall frost (Dec 5) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 95645 came on Jan 31 — about the same time as the 1991–2020 average (Feb 1).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Soil in Knights Landing, CA

The soil mapped at the center of ZIP 95645 is Shanghai — silty clay loam, somewhat poorly drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up
pH7.5slightly alkaline; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter1.5%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Shanghai silty clay loam, 0 to 2 percent slopes.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 95645; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Knights Landing, CA

Summer high95 °Faverage high, July
Winter low38 °Faverage low, January
Hot days96days a year at 90 °F or more
Freezing nights9nights a year at 32 °F or less
Growing degree days4,768base 50 °F — the season’s usable heat
Longest day14 h 54 mindaylight on June 21
Shortest day9 h 26 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation18.8 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°110°32 °FJanuary: average high 56 °F, low 38 °F 56°38° JanFebruary: average high 62 °F, low 41 °F 62°41° FebMarch: average high 68 °F, low 44 °F 68°44° MarApril: average high 74 °F, low 47 °F 74°47° AprMay: average high 82 °F, low 52 °F 82°52° MayJune: average high 90 °F, low 57 °F 90°57° JunJuly: average high 95 °F, low 58 °F 95°58° JulAugust: average high 94 °F, low 57 °F 94°57° AugSeptember: average high 90 °F, low 56 °F 90°56° SepOctober: average high 80 °F, low 50 °F 80°50° OctNovember: average high 65 °F, low 43 °F 65°43° NovDecember: average high 56 °F, low 38 °F 56°38° Dec

Precipitation by month inches

0″1″2″3″4″January: 3.69 in precipitation 3.7 JanFebruary: 3.34 in precipitation 3.3 FebMarch: 2.97 in precipitation 3.0 MarApril: 1.30 in precipitation 1.3 AprMay: 0.78 in precipitation 0.8 MayJune: 0.23 in precipitation 0.2 JunJuly: 0.00 in precipitation 0.0 JulAugust: 0.03 in precipitation 0.0 AugSeptember: 0.12 in precipitation 0.1 SepOctober: 0.79 in precipitation 0.8 OctNovember: 1.94 in precipitation 1.9 NovDecember: 3.65 in precipitation 3.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Woodland 1 Wnw, CA (14 mi away); precipitation: Nicolaus #2, CA (14 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 9b.

956769b
Robbins, CA · 5 mi
956989b
Zamora, CA · 8 mi
959379b
Dunnigan, CA · 11 mi
959579b
Meridian, CA · 11 mi
956979b
Yolo, CA · 11 mi
956599b
Nicolaus, CA · 11 mi
959509b
Grimes, CA · 12 mi
959919b
Yuba City, CA · 13 mi

California planting zones →

Questions about 95645

What planting zone is ZIP code 95645?

ZIP code 95645 (Knights Landing, CA) is in USDA hardiness zone 9b on the 2023 map: the coldest night of an average winter reaches 25 to 30 °F (−3.9 to −1.1 °C).

When is the last frost in Knights Landing, CA?

The median last spring frost (32 °F) near 95645 is February 7; after March 11 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Woodland 1 Wnw station.

When is the first frost in Knights Landing, CA?

The median first fall frost near 95645 is December 5, giving a median frost-free growing season of 301 days.

When should I plant tomatoes in 95645?

Start tomato seeds indoors around Dec 13 – Dec 27 and set transplants outside around Feb 14 – Feb 28, one to three weeks after the median last frost.

How much rain and snow does 95645 get?

About 18.8 inches of precipitation a year (NOAA 1991–2020 normals, Nicolaus #2 station).

How hot do summers get in Knights Landing, CA?

The average high peaks at 95 °F in July, with about 96 days a year at 90 °F or more.

What kind of soil does 95645 have?

The USDA soil survey maps Shanghai at the center of ZIP 95645: silty clay loam, somewhat poorly drained, pH about 7.5 (slightly alkaline).

Did spring come early in Knights Landing, CA in 2026?

Spring leaf-out near 95645 came on Jan 31 in 2026, about the same as the 1991–2020 average (Feb 1), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Knights Landing, CA?

Intermediate onions: the longest day near 95645 is 14 h 54 min, so day-neutral types bulb best; long-day varieties may not bulb fully.