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

Planting zone for 93606 — Biola, CA

ZIP code 93606 (Biola, Fresno County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is February 18 and the first fall frost November 27.

Where ZIP 93606 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.

Zone9a20 to 25 °F
Coldest night−6.7 to −3.9 °C
Last frostFeb 18
First frostNov 27
2012 zone9a

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 9a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Biola, 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 Biola, 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 18only 10% chance of frost after
First fall frostNovember 27median — 10% chance by Nov 10
Growing season281 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 21 and returns around December 10.

From the NOAA station Madera, CA — 11 miles away, elevation 269 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 93606

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 2 – Oct 16
GarlicPlant cloves · Nov 13 – Dec 18
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 18) and first fall frost (Nov 27) 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 93606 came on Jan 30 — 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 Biola, CA

The soil mapped at the center of ZIP 93606 is Hanford — coarse sandy loam, well drained.

TextureCoarse sandy loamdrains and warms fast; dries out and needs more feeding
pH6.7neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classPrime farmland if irrigatedUSDA classification

Map unit: Hanford coarse sandy loam.

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 93606; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Biola, CA

Summer high96 °Faverage high, July
Winter low36 °Faverage low, December
Hot days100days a year at 90 °F or more
Freezing nights26nights a year at 32 °F or less
Growing degree days4,942base 50 °F — the season’s usable heat
Longest day14 h 41 mindaylight on June 21
Shortest day9 h 38 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation11.4 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 55 °F, low 38 °F 55°38° JanFebruary: average high 61 °F, low 40 °F 61°40° FebMarch: average high 67 °F, low 44 °F 67°44° MarApril: average high 73 °F, low 47 °F 73°47° AprMay: average high 82 °F, low 53 °F 82°53° MayJune: average high 90 °F, low 59 °F 90°59° JunJuly: average high 96 °F, low 64 °F 96°64° JulAugust: average high 95 °F, low 63 °F 95°63° AugSeptember: average high 89 °F, low 58 °F 89°58° SepOctober: average high 78 °F, low 49 °F 78°49° OctNovember: average high 64 °F, low 41 °F 64°41° NovDecember: average high 55 °F, low 36 °F 55°36° Dec

Precipitation by month inches

0″1″2″3″January: 2.44 in precipitation 2.4 JanFebruary: 1.79 in precipitation 1.8 FebMarch: 2.34 in precipitation 2.3 MarApril: 0.96 in precipitation 1.0 AprMay: 0.44 in precipitation 0.4 MayJune: 0.16 in precipitation 0.2 JunJuly: 0.03 in precipitation 0.0 JulAugust: 0.01 in precipitation 0.0 AugSeptember: 0.08 in precipitation 0.1 SepOctober: 0.59 in precipitation 0.6 OctNovember: 0.87 in precipitation 0.9 NovDecember: 1.70 in precipitation 1.7 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Madera, CA (11 mi away); precipitation: Fresno 2.4 Nw, CA (11 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.

937239b
Fresno, CA · 4 mi
937229b
Fresno, CA · 8 mi
936309a
Kerman, CA · 8 mi
937119b
Fresno, CA · 10 mi
937059b
Fresno, CA · 10 mi
937069b
Fresno, CA · 11 mi
937289b
Fresno, CA · 11 mi
936399b
Madera, CA · 12 mi

California planting zones →

Questions about 93606

What planting zone is ZIP code 93606?

ZIP code 93606 (Biola, CA) is in USDA hardiness zone 9a on the 2023 map: the coldest night of an average winter reaches 20 to 25 °F (−6.7 to −3.9 °C).

When is the last frost in Biola, CA?

The median last spring frost (32 °F) near 93606 is February 18; after March 18 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Madera station.

When is the first frost in Biola, CA?

The median first fall frost near 93606 is November 27, giving a median frost-free growing season of 281 days.

When should I plant tomatoes in 93606?

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 93606 get?

About 11.4 inches of precipitation a year (NOAA 1991–2020 normals, Fresno 2.4 Nw station).

How hot do summers get in Biola, CA?

The average high peaks at 96 °F in July, with about 100 days a year at 90 °F or more.

What kind of soil does 93606 have?

The USDA soil survey maps Hanford at the center of ZIP 93606: coarse sandy loam, well drained, pH about 6.7 (neutral).

Did spring come early in Biola, CA in 2026?

Spring leaf-out near 93606 came on Jan 30 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 Biola, CA?

Intermediate onions: the longest day near 93606 is 14 h 41 min, so day-neutral types bulb best; long-day varieties may not bulb fully.