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

Planting zone for 00772 — Loiza, PR

ZIP code 00772 (Loiza, Loiza County) is in USDA zone 13a: the coldest winter night averages 60 to 65 °F.

Where ZIP 00772 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.

Zone13a60 to 65 °F

Coldest night15.6 to 18.3 °C

Last frostrare

First frostrare

2012 zone—

The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 13a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Loiza, PR…

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

Frost is rare or absent here: Loiza, PR is in zone 13a, where the coldest night of a typical winter stays above freezing. Cool-season vegetables grow best from fall through spring; summer heat, not frost, is the limit.

Soil in Loiza, PR

The soil mapped at the center of ZIP 00772 is Tidal swamp — variable, very poorly drained.

TextureVariabletop layer

pH7.0neutral; most vegetables like 6.0–7.0

DrainageVery poorly drainedconsider raised beds

Hydrologic groupC/Dslow when drained; wet otherwise

Farmland classNot prime farmlandUSDA classification

Map unit: Tidal swamp.

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 00772; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Loiza, PR

Longest day13 h 14 mindaylight on June 21

Shortest day11 h 01 mindaylight on December 21

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

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.

Puerto Rico planting zones →

Questions about 00772

What planting zone is ZIP code 00772?

ZIP code 00772 (Loiza, PR) is in USDA hardiness zone 13a on the 2023 map: the coldest night of an average winter reaches 60 to 65 °F (15.6 to 18.3 °C).

What kind of soil does 00772 have?

The USDA soil survey maps Tidal swamp at the center of ZIP 00772: variable, very poorly drained, pH about 7.0 (neutral).

What kind of onions grow in Loiza, PR?

Short-day onions: the longest day near 00772 is 13 h 14 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.