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

Planting zone for 77433 — Cypress, TX

ZIP code 77433 (Cypress, Harris County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is February 19 and the first fall frost December 3.

Where ZIP 77433 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 19

First frostDec 3

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 Cypress, 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 Cypress, TX

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostFebruary 19median — 50% chance of a later frost

Safe for tender plantsMarch 15only 10% chance of frost after

First fall frostDecember 3median — 10% chance by Nov 13

Growing season290 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 31 and returns around December 29.

From the NOAA station Houston Hooks Mem Airport, TX — 14 miles away, elevation 151 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 77433

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Jan 8 – Jan 22

SpinachSow outdoors · Jan 8 – Jan 29

Broccoli, cabbageStart indoors · Dec 11 – Dec 25

Broccoli, cabbageTransplant · Jan 29 – Feb 12

Onion setsPlant outdoors · Jan 22 – Feb 5

PotatoesPlant outdoors · Jan 29 – Feb 12

LettuceSow outdoors · Jan 22 – Feb 5

Carrots, beetsSow outdoors · Jan 29 – Feb 12

TomatoesStart indoors · Dec 25 – Jan 8

TomatoesTransplant · Feb 26 – Mar 12

Peppers, eggplantStart indoors · Dec 11 – Dec 25

Peppers, eggplantTransplant · Mar 5 – Mar 19

BeansSow outdoors · Feb 26 – Mar 12

Sweet cornSow outdoors · Feb 26 – Mar 12

Cucumbers, squashSow outdoors · Feb 26 – Mar 12

Fall lettuce, spinachSow outdoors · Oct 8 – Oct 22

GarlicPlant cloves · Nov 19 – Dec 24

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 19) and first fall frost (Dec 3) 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 77433 came on Jan 10 — 14 days earlier than the 1991–2020 average (Jan 24).

average
Jan 242026
Jan 10

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 9a in Texas

640 plants native to the lower 48 states, recorded in Texas, and rated by the USDA to survive 20 °F or colder — the bottom of zone 9a. 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 Cypress, TX.

Soil in Cypress, TX

The soil mapped at the center of ZIP 77433 is Addicks — loam, moderately well drained.

TextureLoama good balance for most vegetables

pH6.8neutral; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter1.5%low — add compost

Hydrologic groupB/Dmoderate when drained; wet otherwise

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Addicks loam, 0 to 1 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 77433; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Cypress, TX

Summer high95 °Faverage high, August

Winter low43 °Faverage low, January

Hot days111days a year at 90 °F or more

Freezing nights14nights a year at 32 °F or less

Growing degree days7,443base 50 °F — the season’s usable heat

Longest day14 h 04 mindaylight on June 21

Shortest day10 h 13 mindaylight on December 21

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

Precipitation51.3 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: Houston Hooks Mem Airport, TX (14 mi away); precipitation: Cypress, TX (6 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

All 3 ZIP codes in Cypress → · Texas planting zones →

Questions about 77433

What planting zone is ZIP code 77433?

ZIP code 77433 (Cypress, TX) 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 Cypress, TX?

The median last spring frost (32 °F) near 77433 is February 19; after March 15 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Houston Hooks Mem Airport station.

When is the first frost in Cypress, TX?

The median first fall frost near 77433 is December 3, giving a median frost-free growing season of 290 days.

When should I plant tomatoes in 77433?

Start tomato seeds indoors around Dec 25 – Jan 8 and set transplants outside around Feb 26 – Mar 12, one to three weeks after the median last frost.

How much rain and snow does 77433 get?

About 51.3 inches of precipitation a year (NOAA 1991–2020 normals, Cypress station).

How hot do summers get in Cypress, TX?

The average high peaks at 95 °F in August, with about 111 days a year at 90 °F or more.

What kind of soil does 77433 have?

The USDA soil survey maps Addicks at the center of ZIP 77433: loam, moderately well drained, pH about 6.8 (neutral).

Did spring come early in Cypress, TX in 2026?

Spring leaf-out near 77433 came on Jan 10 in 2026, 14 days earlier than the 1991–2020 average (Jan 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Cypress, TX?

Short-day onions: the longest day near 77433 is 14 h 04 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.