Planting zone for 78549 — Hargill, TX
ZIP code 78549 (Hargill, Hidalgo County) is in USDA zone 9b: the coldest winter night averages 25 to 30 °F.
Where ZIP 78549 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.
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 9b means →
Frost forecast — next 7 nights
live from the National Weather ServiceLoading the forecast for Hargill, 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 Edinburg 17 Nne, TX — 3 miles away, elevation 66 ft) the median growing season is 338 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 78549 came on Jan 9 — 7 days earlier than the 1991–2020 average (Jan 16).
Jan 162026
Jan 9
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 Hargill, TX
The soil mapped at the center of ZIP 78549 is Hargill — fine sandy loam, well drained.
Map unit: Hargill fine sandy loam, 1 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 78549; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.
Climate in Hargill, TX
Average high and low, by month
Precipitation by month inches
NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Edinburg 17 Nne, TX (3 mi away); precipitation: Edinburg 17 Nne, TX (3 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.
Questions about 78549
What planting zone is ZIP code 78549?
ZIP code 78549 (Hargill, 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 78549 get?
About 23.6 inches of precipitation a year (NOAA 1991–2020 normals, Edinburg 17 Nne station).
How hot do summers get in Hargill, TX?
The average high peaks at 98 °F in July, with about 174 days a year at 90 °F or more.
What kind of soil does 78549 have?
The USDA soil survey maps Hargill at the center of ZIP 78549: fine sandy loam, well drained, pH about 7.2 (neutral).
Did spring come early in Hargill, TX in 2026?
Spring leaf-out near 78549 came on Jan 9 in 2026, 7 days earlier than the 1991–2020 average (Jan 16), according to the USA National Phenology Network Spring Index.
What kind of onions grow in Hargill, TX?
Short-day onions: the longest day near 78549 is 13 h 48 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.