Planting zone for 77587 — South Houston, TX
ZIP code 77587 (South Houston, Harris County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F.
Where ZIP 77587 is
Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoomNot 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.
Was 9a on the 2012 map — half a zone warmer now. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 9b means →
Frost forecast — next 7 nights
live from the National Weather ServiceLoading the forecast for South Houston, 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
A 32 °F frost doesn't happen here in most winters. At the nearest station (NOAA station Houston Hobby Airport, TX — 4 miles away, elevation 43 ft) the median growing season is 330 days. When frost does come, it is a midwinter night or two; cover tender plants when a freeze is forecast.
Frost data: NOAA NCEI U.S. Climate Normals 1991–2020.
When spring arrived in 2026
In 2026, spring leaf-out near 77587 came on Jan 10 — 12 days earlier than the 1991–2020 average (Jan 22).
Jan 222026
Jan 10
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 South Houston, TX
The soil mapped at the center of ZIP 77587 is Lake Charles — clay, moderately well drained.
Map unit: Lake Charles-Urban land complex, 0 to 3 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 77587; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.
Climate in South Houston, TX
Average high and low, by month
Precipitation by month inches
NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Houston Hobby Airport, TX (4 mi away); precipitation: Pasadena 4.4 Wnw, TX (2 mi away). Daylight is calculated from latitude.
Nearby ZIP codes
All 8 nearest ZIP codes share zone 9b.
Questions about 77587
What planting zone is ZIP code 77587?
ZIP code 77587 (South Houston, TX) is in USDA hardiness zone 9b on the 2023 map: the coldest night of an average winter reaches 25 to 30 °F (−3.9 to −1.1 °C).
How much rain and snow does 77587 get?
About 57 inches of precipitation a year (NOAA 1991–2020 normals, Pasadena 4.4 Wnw station).
How hot do summers get in South Houston, TX?
The average high peaks at 94 °F in August, with about 101 days a year at 90 °F or more.
What kind of soil does 77587 have?
The USDA soil survey maps Lake Charles at the center of ZIP 77587: clay, moderately well drained, pH about 7.1 (neutral).
Did spring come early in South Houston, TX in 2026?
Spring leaf-out near 77587 came on Jan 10 in 2026, 12 days earlier than the 1991–2020 average (Jan 22), according to the USA National Phenology Network Spring Index.
What kind of onions grow in South Houston, TX?
Short-day onions: the longest day near 77587 is 14 h 03 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.
Did the zone for 77587 change?
Yes. The 2012 USDA map put 77587 in zone 9a; the 2023 map puts it in zone 9b. The newer map uses 1991–2020 data and more weather stations.