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

Planting zone for 95687 — Vacaville, CA

ZIP code 95687 (Vacaville, Solano County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F. The median last spring frost is February 18 and the first fall frost November 28.

Where ZIP 95687 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 18
First frostNov 28
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 Vacaville, 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 Vacaville, CA

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostFebruary 18median — 50% chance of a later frost
Safe for tender plantsMarch 25only 10% chance of frost after
First fall frostNovember 28median — 10% chance by Nov 12
Growing season283 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 15 and returns around December 10.

From the NOAA station Vacaville Nut Tree Airport, CA — 4 miles away, elevation 108 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 95687

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 7 – Jan 21
SpinachSow outdoors · Jan 7 – Jan 28
Broccoli, cabbageStart indoors · Dec 10 – Dec 24
Broccoli, cabbageTransplant · Jan 28 – Feb 11
Onion setsPlant outdoors · Jan 21 – Feb 4
PotatoesPlant outdoors · Jan 28 – Feb 11
LettuceSow outdoors · Jan 21 – Feb 4
Carrots, beetsSow outdoors · Jan 28 – Feb 11
TomatoesStart indoors · Dec 24 – Jan 7
TomatoesTransplant · Feb 25 – Mar 11
Peppers, eggplantStart indoors · Dec 10 – Dec 24
Peppers, eggplantTransplant · Mar 4 – Mar 18
BeansSow outdoors · Feb 25 – Mar 11
Sweet cornSow outdoors · Feb 25 – Mar 11
Cucumbers, squashSow outdoors · Feb 25 – Mar 11
Fall lettuce, spinachSow outdoors · Oct 3 – Oct 17
GarlicPlant cloves · Nov 14 – Dec 19
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 18) and first fall frost (Nov 28) 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 95687 came on Jan 31 — about the same time as the 1991–2020 average (Jan 31).

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 Vacaville, CA

The soil mapped at the center of ZIP 95687 is Capay — silty clay loam, moderately well drained.

TextureSilty clay loamholds water and nutrients; slow to drain and warm up
pH7.1neutral; most vegetables like 6.0–7.0
DrainageModerately well drainednatural drainage class
Organic matter1.9%low — add compost
Hydrologic groupCwater soaks in slowly
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Capay silty clay loam, 0 percent slopes, MLRA 17.

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 95687; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Vacaville, CA

Summer high95 °Faverage high, July
Winter low37 °Faverage low, December
Hot days88days a year at 90 °F or more
Freezing nights21nights a year at 32 °F or less
Growing degree days4,707base 50 °F — the season’s usable heat
Longest day14 h 50 mindaylight on June 21
Shortest day9 h 29 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation24.8 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 58 °F, low 38 °F 58°38° JanFebruary: average high 63 °F, low 40 °F 63°40° FebMarch: average high 68 °F, low 43 °F 68°43° MarApril: average high 73 °F, low 46 °F 73°46° AprMay: average high 81 °F, low 51 °F 81°51° MayJune: average high 90 °F, low 56 °F 90°56° JunJuly: average high 95 °F, low 59 °F 95°59° JulAugust: average high 94 °F, low 58 °F 94°58° AugSeptember: average high 91 °F, low 56 °F 91°56° SepOctober: average high 80 °F, low 49 °F 80°49° OctNovember: average high 67 °F, low 42 °F 67°42° NovDecember: average high 58 °F, low 37 °F 58°37° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 5.26 in precipitation 5.3 JanFebruary: 5.06 in precipitation 5.1 FebMarch: 3.69 in precipitation 3.7 MarApril: 1.29 in precipitation 1.3 AprMay: 0.81 in precipitation 0.8 MayJune: 0.17 in precipitation 0.2 JunJuly: 0.01 in precipitation 0.0 JulAugust: 0.02 in precipitation 0.0 AugSeptember: 0.06 in precipitation 0.1 SepOctober: 1.08 in precipitation 1.1 OctNovember: 2.31 in precipitation 2.3 NovDecember: 5.08 in precipitation 5.1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Vacaville Nut Tree Airport, CA (4 mi away); precipitation: Vacaville Nut Tree Airport, CA (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 9b.

956259b
Elmira, CA · 2 mi
945359b
Travis Afb, CA · 4 mi
945339b
Fairfield, CA · 6 mi
956969b
Vacaville, CA · 8 mi
956889b
Vacaville, CA · 9 mi
945859b
Suisun City, CA · 10 mi
956209b
Dixon, CA · 10 mi
945349b
Fairfield, CA · 12 mi

All 3 ZIP codes in Vacaville → · California planting zones →

Questions about 95687

What planting zone is ZIP code 95687?

ZIP code 95687 (Vacaville, 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 Vacaville, CA?

The median last spring frost (32 °F) near 95687 is February 18; after March 25 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Vacaville Nut Tree Airport station.

When is the first frost in Vacaville, CA?

The median first fall frost near 95687 is November 28, giving a median frost-free growing season of 283 days.

When should I plant tomatoes in 95687?

Start tomato seeds indoors around Dec 24 – Jan 7 and set transplants outside around Feb 25 – Mar 11, one to three weeks after the median last frost.

How much rain and snow does 95687 get?

About 24.8 inches of precipitation a year (NOAA 1991–2020 normals, Vacaville Nut Tree Airport station).

How hot do summers get in Vacaville, CA?

The average high peaks at 95 °F in July, with about 88 days a year at 90 °F or more.

What kind of soil does 95687 have?

The USDA soil survey maps Capay at the center of ZIP 95687: silty clay loam, moderately well drained, pH about 7.1 (neutral).

Did spring come early in Vacaville, CA in 2026?

Spring leaf-out near 95687 came on Jan 31 in 2026, about the same as the 1991–2020 average (Jan 31), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Vacaville, CA?

Intermediate onions: the longest day near 95687 is 14 h 50 min, so day-neutral types bulb best; long-day varieties may not bulb fully.