Frost dates in Puerto Rico

Frost is rare in Puerto Rico: at all 27 of its NOAA stations with temperature records, a freezing night comes in fewer than 1 year in 10, too rarely for frost dates. The hardiness zone matters more here: the USDA added zones 12 and 13, which appear only in Hawaii and Puerto Rico, to describe conditions for tropical and semitropical plants.

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Frost in Puerto Rico

None of Puerto Rico's towns has a page of its own here, because frost is too rare at the stations nearest them for frost dates to mean much. The station list below has every NOAA station in the state, and the ZIP code lookup above gives your hardiness zone.

Hardiness zones in Puerto Rico

Puerto Rico's 176 ZIP codes in the USDA list fall in zones 11b to 13b: 11b (1 percent), 12a (3 percent), 12b (24 percent), 13a (57 percent) and 13b (15 percent). Compared with the 2012 map, 19 percent of them moved to a warmer half zone (4 by a full zone or more), 76 percent stayed the same and 8 moved to a colder one.

A hardiness zone is about the coldest night of winter, which decides which shrubs, trees and perennials survive. Frost dates are about spring and fall, which decide when to plant. You need both. Read more about what the zones mean and what changed in 2023.

Every NOAA station in Puerto Rico

All 27 stations in Puerto Rico with frost statistics in NOAA's 1991 to 2020 normals, from A to Z. Station names are usually a town, an airport, or a distance and direction from a town. Find one near you and at a similar elevation.

Typical (1-in-2) dates at 32°F. For the early and late years, and a planting calendar built from your own dates, look up your ZIP code.