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

Planting zone for 77471 — Rosenberg, TX

ZIP code 77471 (Rosenberg, Fort Bend County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is February 9 and the first fall frost December 13.

Where ZIP 77471 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 9

First frostDec 13

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 Rosenberg, 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 Rosenberg, TX

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostFebruary 9median — 50% chance of a later frost

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

First fall frostDecember 13median — 10% chance by Nov 19

Growing season305 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 28 and returns around January 1.

From the NOAA station Sugar Land, TX — 13 miles away, elevation 85 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 77471

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Dec 29 – Jan 12

SpinachSow outdoors · Dec 29 – Jan 19

Broccoli, cabbageStart indoors · Dec 1 – Dec 15

Broccoli, cabbageTransplant · Jan 19 – Feb 2

Onion setsPlant outdoors · Jan 12 – Jan 26

PotatoesPlant outdoors · Jan 19 – Feb 2

LettuceSow outdoors · Jan 12 – Jan 26

Carrots, beetsSow outdoors · Jan 19 – Feb 2

TomatoesStart indoors · Dec 15 – Dec 29

TomatoesTransplant · Feb 16 – Mar 2

Peppers, eggplantStart indoors · Dec 1 – Dec 15

Peppers, eggplantTransplant · Feb 23 – Mar 9

BeansSow outdoors · Feb 16 – Mar 2

Sweet cornSow outdoors · Feb 16 – Mar 2

Cucumbers, squashSow outdoors · Feb 16 – Mar 2

Fall lettuce, spinachSow outdoors · Oct 18 – Nov 1

GarlicPlant cloves · Nov 29 – Jan 3

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 9) and first fall frost (Dec 13) 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 77471 came on Jan 15 — 8 days earlier than the 1991–2020 average (Jan 23).

average
Jan 232026
Jan 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).

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 Rosenberg, TX.

Soil in Rosenberg, TX

The soil mapped at the center of ZIP 77471 is Lake Charles — clay, moderately well drained.

TextureClayholds water and nutrients; slow to drain and warm up

pH7.1neutral; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter4%moderate

Hydrologic groupDwater soaks in very slowly

Farmland classprime farmlandUSDA classification

Map unit: Lake Charles clay, 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 77471; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Rosenberg, TX

Summer high94 °Faverage high, July

Winter low43 °Faverage low, January

Hot days116days a year at 90 °F or more

Freezing nights7nights a year at 32 °F or less

Growing degree days7,712base 50 °F — the season’s usable heat

Longest day14 h 02 mindaylight on June 21

Shortest day10 h 15 mindaylight on December 21

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

Precipitation51.1 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: Sugar Land, TX (13 mi away); precipitation: Richmond, TX (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

774969b

Sugar Land, TX · 7 mi

Kendleton, TX · 11 mi

Texas planting zones →

Questions about 77471

What planting zone is ZIP code 77471?

ZIP code 77471 (Rosenberg, 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 Rosenberg, TX?

The median last spring frost (32 °F) near 77471 is February 9; after March 11 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Sugar Land station.

When is the first frost in Rosenberg, TX?

The median first fall frost near 77471 is December 13, giving a median frost-free growing season of 305 days.

When should I plant tomatoes in 77471?

Start tomato seeds indoors around Dec 15 – Dec 29 and set transplants outside around Feb 16 – Mar 2, one to three weeks after the median last frost.

How much rain and snow does 77471 get?

About 51.1 inches of precipitation a year (NOAA 1991–2020 normals, Richmond station).

How hot do summers get in Rosenberg, TX?

The average high peaks at 94 °F in July, with about 116 days a year at 90 °F or more.

What kind of soil does 77471 have?

The USDA soil survey maps Lake Charles at the center of ZIP 77471: clay, moderately well drained, pH about 7.1 (neutral).

Did spring come early in Rosenberg, TX in 2026?

Spring leaf-out near 77471 came on Jan 15 in 2026, 8 days earlier than the 1991–2020 average (Jan 23), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Rosenberg, TX?

Short-day onions: the longest day near 77471 is 14 h 02 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.