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

Planting zone for 95615 — Courtland, CA

ZIP code 95615 (Courtland, Sacramento County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F. The median last spring frost is February 2 and the first fall frost December 2.

Where ZIP 95615 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 2
First frostDec 2
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 Courtland, 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 Courtland, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostFebruary 2median — 50% chance of a later frost
Safe for tender plantsMarch 5only 10% chance of frost after
First fall frostDecember 2median — 10% chance by Nov 16
Growing season301 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 4 and returns around December 16.

From the NOAA station Sacramento Executive Airport, CA — 14 miles away, elevation 16 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 95615

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Dec 22 – Jan 5
SpinachSow outdoors · Dec 22 – Jan 12
Broccoli, cabbageStart indoors · Nov 24 – Dec 8
Broccoli, cabbageTransplant · Jan 12 – Jan 26
Onion setsPlant outdoors · Jan 5 – Jan 19
PotatoesPlant outdoors · Jan 12 – Jan 26
LettuceSow outdoors · Jan 5 – Jan 19
Carrots, beetsSow outdoors · Jan 12 – Jan 26
TomatoesStart indoors · Dec 8 – Dec 22
TomatoesTransplant · Feb 9 – Feb 23
Peppers, eggplantStart indoors · Nov 24 – Dec 8
Peppers, eggplantTransplant · Feb 16 – Mar 2
BeansSow outdoors · Feb 9 – Feb 23
Sweet cornSow outdoors · Feb 9 – Feb 23
Cucumbers, squashSow outdoors · Feb 9 – Feb 23
Fall lettuce, spinachSow outdoors · Oct 7 – Oct 21
GarlicPlant cloves · Nov 18 – Dec 23
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 2) and first fall frost (Dec 2) 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 95615 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 Courtland, CA

The soil mapped at the center of ZIP 95615 is Gazwell — mucky clay, very poorly drained.

TextureMucky clayholds water and nutrients; slow to drain and warm up
pH5.8moderately acidic; most vegetables like 6.0–7.0
DrainageVery poorly drainedconsider raised beds
Organic matter11%high
Hydrologic groupB/Dmoderate when drained; wet otherwise
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Gazwell mucky clay, partially drained, 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 95615; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Courtland, CA

Summer high93 °Faverage high, July
Winter low39 °Faverage low, January
Hot days76days a year at 90 °F or more
Freezing nights15nights a year at 32 °F or less
Growing degree days4,621base 50 °F — the season’s usable heat
Longest day14 h 50 mindaylight on June 21
Shortest day9 h 30 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation18.1 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°32 °FJanuary: average high 56 °F, low 39 °F 56°39° JanFebruary: average high 61 °F, low 42 °F 61°42° FebMarch: average high 66 °F, low 45 °F 66°45° MarApril: average high 72 °F, low 47 °F 72°47° AprMay: average high 80 °F, low 52 °F 80°52° MayJune: average high 88 °F, low 57 °F 88°57° JunJuly: average high 93 °F, low 59 °F 93°59° JulAugust: average high 92 °F, low 59 °F 92°59° AugSeptember: average high 89 °F, low 57 °F 89°57° SepOctober: average high 79 °F, low 50 °F 79°50° OctNovember: average high 65 °F, low 43 °F 65°43° NovDecember: average high 56 °F, low 39 °F 56°39° Dec

Precipitation by month inches

0″1″2″3″4″January: 3.66 in precipitation 3.7 JanFebruary: 3.49 in precipitation 3.5 FebMarch: 2.68 in precipitation 2.7 MarApril: 1.26 in precipitation 1.3 AprMay: 0.75 in precipitation 0.8 MayJune: 0.23 in precipitation 0.2 JunJuly: 0.00 in precipitation 0.0 JulAugust: 0.04 in precipitation 0.0 AugSeptember: 0.09 in precipitation 0.1 SepOctober: 0.85 in precipitation 0.8 OctNovember: 1.66 in precipitation 1.7 NovDecember: 3.43 in precipitation 3.4 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Sacramento Executive Airport, CA (14 mi away); precipitation: Sacramento Executive Airport, CA (14 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 9b.

956809b
Ryde, CA · 5 mi
956129b
Clarksburg, CA · 5 mi
957579b
Elk Grove, CA · 6 mi
956399b
Hood, CA · 7 mi
956909b
Walnut Grove, CA · 9 mi
957589b
Elk Grove, CA · 10 mi
958329b
Sacramento, CA · 10 mi
956869b
Thornton, CA · 11 mi

California planting zones →

Questions about 95615

What planting zone is ZIP code 95615?

ZIP code 95615 (Courtland, 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 Courtland, CA?

The median last spring frost (32 °F) near 95615 is February 2; after March 5 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Sacramento Executive Airport station.

When is the first frost in Courtland, CA?

The median first fall frost near 95615 is December 2, giving a median frost-free growing season of 301 days.

When should I plant tomatoes in 95615?

Start tomato seeds indoors around Dec 8 – Dec 22 and set transplants outside around Feb 9 – Feb 23, one to three weeks after the median last frost.

How much rain and snow does 95615 get?

About 18.1 inches of precipitation a year (NOAA 1991–2020 normals, Sacramento Executive Airport station).

How hot do summers get in Courtland, CA?

The average high peaks at 93 °F in July, with about 76 days a year at 90 °F or more.

What kind of soil does 95615 have?

The USDA soil survey maps Gazwell at the center of ZIP 95615: mucky clay, very poorly drained, pH about 5.8 (moderately acidic).

Did spring come early in Courtland, CA in 2026?

Spring leaf-out near 95615 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 Courtland, CA?

Intermediate onions: the longest day near 95615 is 14 h 50 min, so day-neutral types bulb best; long-day varieties may not bulb fully.