Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 93642 — Mono Hot Springs, CA

ZIP code 93642 (Mono Hot Springs, Fresno County) is in USDA zone 6a: the coldest winter night averages −10 to −5 °F. The median last spring frost is June 1 and the first fall frost October 6.

Where ZIP 93642 is

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.

Zone6a−10 to −5 °F

Coldest night−23.3 to −20.6 °C

Last frostJun 1

First frostOct 6

2012 zone6b

Was 6b on the 2012 map — half a zone colder now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 6a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Mono Hot Springs, 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 Mono Hot Springs, CA

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostJune 1median — 50% chance of a later frost

Safe for tender plantsJune 18only 10% chance of frost after

First fall frostOctober 6median — 10% chance by Sep 19

Growing season129 daysfrost-free, median

A hard freeze (28 °F) usually ends around May 12 and returns around October 25.

From the NOAA station Huntington Lake, CA — 13 miles away, elevation 7,021 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 93642

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Apr 20 – May 4

SpinachSow outdoors · Apr 20 – May 11

Broccoli, cabbageStart indoors · Mar 23 – Apr 6

Broccoli, cabbageTransplant · May 11 – May 25

Onion setsPlant outdoors · May 4 – May 18

PotatoesPlant outdoors · May 11 – May 25

LettuceSow outdoors · May 4 – May 18

Carrots, beetsSow outdoors · May 11 – May 25

TomatoesStart indoors · Apr 6 – Apr 20

TomatoesTransplant · Jun 8 – Jun 22

Peppers, eggplantStart indoors · Mar 23 – Apr 6

Peppers, eggplantTransplant · Jun 15 – Jun 29

BeansSow outdoors · Jun 8 – Jun 22

Sweet cornSow outdoors · Jun 8 – Jun 22

Cucumbers, squashSow outdoors · Jun 8 – Jun 22

Fall lettuce, spinachSow outdoors · Aug 11 – Aug 25

GarlicPlant cloves · Sep 22 – Oct 27

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Jun 1) and first fall frost (Oct 6) 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 93642 came on Mar 15 — 37 days earlier than the 1991–2020 average (Apr 21).

average
Apr 212026
Mar 15

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 Mono Hot Springs, CA

The soil mapped at the center of ZIP 93642 is Lithic Xeropsamments — loamy coarse sand, excessively drained.

TextureLoamy coarse sanddrains and warms fast; dries out and needs more feeding

pH5.4strongly acidic; most vegetables like 6.0–7.0

DrainageExcessively drainednatural drainage class

Organic matter2%moderate

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Rock outcrop-Lithic Xeropsamments complex, 15 to 45 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 93642; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Mono Hot Springs, CA

Summer high74 °Faverage high, July

Winter low23 °Faverage low, February

Hot days0days a year at 90 °F or more

Freezing nights155nights a year at 32 °F or less

Growing degree days1,204base 50 °F — the season’s usable heat

Longest day14 h 44 mindaylight on June 21

Shortest day9 h 35 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation44.4 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Huntington Lake, CA (13 mi away); precipitation: Huntington Lake, CA (13 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

7 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

936345b

Lakeshore, CA · 7 mi

936057b

Big Creek, CA · 16 mi

935466a

Mammoth Lakes, CA · 18 mi

936648a

Shaver Lake, CA · 21 mi

936029a

Auberry, CA · 27 mi

936048b

Bass Lake, CA · 28 mi

936439a

North Fork, CA · 29 mi

936699a

Wishon, CA · 29 mi

California planting zones →

Questions about 93642

What planting zone is ZIP code 93642?

ZIP code 93642 (Mono Hot Springs, CA) is in USDA hardiness zone 6a on the 2023 map: the coldest night of an average winter reaches −10 to −5 °F (−23.3 to −20.6 °C).

When is the last frost in Mono Hot Springs, CA?

The median last spring frost (32 °F) near 93642 is June 1; after June 18 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Huntington Lake station.

When is the first frost in Mono Hot Springs, CA?

The median first fall frost near 93642 is October 6, giving a median frost-free growing season of 129 days.

When should I plant tomatoes in 93642?

Start tomato seeds indoors around Apr 6 – Apr 20 and set transplants outside around Jun 8 – Jun 22, one to three weeks after the median last frost.

How much rain and snow does 93642 get?

About 44.4 inches of precipitation a year (NOAA 1991–2020 normals, Huntington Lake station).

How hot do summers get in Mono Hot Springs, CA?

The average high peaks at 74 °F in July, with about 0 days a year at 90 °F or more.

What kind of soil does 93642 have?

The USDA soil survey maps Lithic Xeropsamments at the center of ZIP 93642: loamy coarse sand, excessively drained, pH about 5.4 (strongly acidic).

Did spring come early in Mono Hot Springs, CA in 2026?

Spring leaf-out near 93642 came on Mar 15 in 2026, 37 days earlier than the 1991–2020 average (Apr 21), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Mono Hot Springs, CA?

Intermediate onions: the longest day near 93642 is 14 h 44 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 93642 change?

Yes. The 2012 USDA map put 93642 in zone 6b; the 2023 map puts it in zone 6a. The newer map uses 1991–2020 data and more weather stations.