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

Planting zone for 78636 — Johnson City, TX

ZIP code 78636 (Johnson City, Blanco County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 22 and the first fall frost November 9.

Where ZIP 78636 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.

Zone8b15 to 20 °F

Coldest night−9.4 to −6.7 °C

Last frostMar 22

First frostNov 9

2012 zone8b

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 8b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Johnson City, TX…

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 Johnson City, TX

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 22median — 50% chance of a later frost

Safe for tender plantsApril 11only 10% chance of frost after

First fall frostNovember 9median — 10% chance by Oct 25

Growing season235 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 6 and returns around November 22.

From the NOAA station Johnson City 2n, TX — within 1 mile, elevation 1,139 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 78636

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 8 – Feb 22

SpinachSow outdoors · Feb 8 – Mar 1

Broccoli, cabbageStart indoors · Jan 11 – Jan 25

Broccoli, cabbageTransplant · Mar 1 – Mar 15

Onion setsPlant outdoors · Feb 22 – Mar 8

PotatoesPlant outdoors · Mar 1 – Mar 15

LettuceSow outdoors · Feb 22 – Mar 8

Carrots, beetsSow outdoors · Mar 1 – Mar 15

TomatoesStart indoors · Jan 25 – Feb 8

TomatoesTransplant · Mar 29 – Apr 12

Peppers, eggplantStart indoors · Jan 11 – Jan 25

Peppers, eggplantTransplant · Apr 5 – Apr 19

BeansSow outdoors · Mar 29 – Apr 12

Sweet cornSow outdoors · Mar 29 – Apr 12

Cucumbers, squashSow outdoors · Mar 29 – Apr 12

Fall lettuce, spinachSow outdoors · Sep 14 – Sep 28

GarlicPlant cloves · Oct 26 – Nov 30

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 22) and first fall frost (Nov 9) 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 78636 came on Jan 30 — about the same time as the 1991–2020 average (Jan 29).

average
Jan 292026
Jan 30

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).

Native plants for zone 8b in Texas

620 plants native to the lower 48 states, recorded in Texas, and rated by the USDA to survive 15 °F or colder — the bottom of zone 8b. Each links to its USDA PLANTS profile.

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Johnson City, TX.

Soil in Johnson City, TX

The soil mapped at the center of ZIP 78636 is Tarpley — stony clay, well drained.

TextureStony clayholds water and nutrients; slow to drain and warm up

pH7.0neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2.5%moderate

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Tarpley-Eckrant complex, 1 to 8 percent slopes, stony.

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 78636; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Johnson City, TX

Summer high97 °Faverage high, August

Winter low35 °Faverage low, January

Hot days111days a year at 90 °F or more

Freezing nights42nights a year at 32 °F or less

Growing degree days6,614base 50 °F — the season’s usable heat

Longest day14 h 06 mindaylight on June 21

Shortest day10 h 11 mindaylight on December 21

Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb

Precipitation33 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: Johnson City 2n, TX (within 1 mile); precipitation: Johnson City 2n, TX (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8b.

786638b

Round Mountain, TX · 10 mi

786358b

Hye, TX · 11 mi

786718b

Stonewall, TX · 14 mi

786578b

Horseshoe Bay, TX · 15 mi

786068b

Blanco, TX · 16 mi

786208b

Dripping Springs, TX · 18 mi

786758b

Willow City, TX · 19 mi

786698b

Spicewood, TX · 20 mi

Texas planting zones →

Questions about 78636

What planting zone is ZIP code 78636?

ZIP code 78636 (Johnson City, TX) is in USDA hardiness zone 8b on the 2023 map: the coldest night of an average winter reaches 15 to 20 °F (−9.4 to −6.7 °C).

When is the last frost in Johnson City, TX?

The median last spring frost (32 °F) near 78636 is March 22; after April 11 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Johnson City 2n station.

When is the first frost in Johnson City, TX?

The median first fall frost near 78636 is November 9, giving a median frost-free growing season of 235 days.

When should I plant tomatoes in 78636?

Start tomato seeds indoors around Jan 25 – Feb 8 and set transplants outside around Mar 29 – Apr 12, one to three weeks after the median last frost.

How much rain and snow does 78636 get?

About 33 inches of precipitation a year (NOAA 1991–2020 normals, Johnson City 2n station).

How hot do summers get in Johnson City, TX?

The average high peaks at 97 °F in August, with about 111 days a year at 90 °F or more.

What kind of soil does 78636 have?

The USDA soil survey maps Tarpley at the center of ZIP 78636: stony clay, well drained, pH about 7.0 (neutral).

Did spring come early in Johnson City, TX in 2026?

Spring leaf-out near 78636 came on Jan 30 in 2026, about the same as the 1991–2020 average (Jan 29), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Johnson City, TX?

Short-day onions: the longest day near 78636 is 14 h 06 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.