Planting zone for 33050 — Marathon, FL
ZIP code 33050 (Marathon, Monroe County) is in USDA zone 11b: the coldest winter night averages 45 to 50 °F.
Where ZIP 33050 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 11b means →
Frost forecast — next 7 nights
live from the National Weather ServiceLoading the forecast for Marathon, FL…
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 Royal Palm Rs, FL — 50 miles away, elevation 7 ft) the median growing season is 365 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 33050 came on Jan 9 — about the same time as the 1991–2020 average (Jan 10).
Jan 102026
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 Marathon, FL
The soil mapped at the center of ZIP 33050 is Matecumbe — muck, poorly drained.
Map unit: Matecumbe muck, 0 to 1 percent slopes, frequently flooded.
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 33050; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.
Climate in Marathon, FL
Average high and low, by month
Precipitation by month inches
NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Curry Hammock Sp, FL (within 1 mile); precipitation: Curry Hammock Sp, FL (within 1 mile). Daylight is calculated from latitude.
Nearby ZIP codes
1 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.
Questions about 33050
What planting zone is ZIP code 33050?
ZIP code 33050 (Marathon, FL) is in USDA hardiness zone 11b on the 2023 map: the coldest night of an average winter reaches 45 to 50 °F (7.2 to 10 °C).
How much rain and snow does 33050 get?
About 46 inches of precipitation a year (NOAA 1991–2020 normals, Curry Hammock Sp station).
How hot do summers get in Marathon, FL?
The average high peaks at 90 °F in July, with about 82 days a year at 90 °F or more.
What kind of soil does 33050 have?
The USDA soil survey maps Matecumbe at the center of ZIP 33050: muck, poorly drained.
Did spring come early in Marathon, FL in 2026?
Spring leaf-out near 33050 came on Jan 9 in 2026, about the same as the 1991–2020 average (Jan 10), according to the USA National Phenology Network Spring Index.
What kind of onions grow in Marathon, FL?
Short-day onions: the longest day near 33050 is 13 h 40 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.