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

Planting zone for Cayey, PR

Cayey, PR is in USDA zones 12a to 12b across its 2 ZIP codes.

Cayey on the zone map

Outlined: its 1 ZIP code areas · 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.

Zones12a–12b50 to 60 °F
ZIP codes2
Last frostrare
First frostrare
Growing seasonall year

12a 1 ZIP   12b 1 ZIP

Frost forecast — next 7 nights

live from the National Weather Service

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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: Cayey, PR is in zone 12b, 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.

Native plants for zone 12a in Puerto Rico

151 plants native to Puerto Rico, recorded in Puerto Rico, and rated by the USDA to survive 50 °F or colder — the bottom of zone 12a. Each links to its USDA PLANTS profile.

Trees 40

achiotillo52 ft · blooms early spring · high shade tolerance · to 40 °Fbastard redwood15 ft · to 40 °Fbullwood100 ft · blooms summer · high shade tolerance · to 40 °Fcabbagebark tree90 ft · blooms summer · high shade tolerance · to 32 °Fcandletree115 ft · blooms early summer · medium shade tolerance · to 50 °Fcobana negra50 ft · blooms spring · to 40 °F

Shrubs 46

American muskwood10 ft · blooms spring · to 40 °FAntilles calophyllum65 ft · blooms late spring · medium shade tolerance · to 36 °Fbastard stopper43 ft · blooms summer · high shade tolerance · to 40 °Fblack mangrove30 ft · blooms indeterminate · high shade tolerance · to 10 °Fbroadleaf caper33 ft · to 40 °Fbroomstick25 ft · blooms spring · medium shade tolerance · to 40 °F

Wildflowers & perennials 30

bayhops1 ft · blooms indeterminate · medium shade tolerance · to 17 °Fbroadleaf arrowhead5 ft · blooms late spring · high shade tolerance · to −33 °Fcinnamon fern5 ft · blooms spring · low shade tolerance · to −33 °Fclimbing dayflower1 ft · blooms summer · low shade tolerance · to 47 °Fcommon duckmeatblooms late summer · medium shade tolerance · to −38 °Fcommon maidenhair1.7 ft · blooms summer · low shade tolerance · to −33 °F

Grasses 34

American cupscale3 ft · blooms early summer · high shade tolerance · to −18 °Fbeaked spikerush3 ft · blooms late spring · high shade tolerance · to −28 °Fbroadleaf carpetgrass1 ft · blooms spring · high shade tolerance · to −3 °Fbroomsedge bluestem3 ft · blooms late spring · high shade tolerance · to −18 °Fbrownseed paspalum3 ft · blooms summer · medium shade tolerance · to 7 °Fbushy bluestem6 ft · blooms late summer · high shade tolerance · to −23 °F

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Cayey, PR.

Climate in Cayey, PR

Longest day13 h 13 mindaylight on June 21
Shortest day11 h 03 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.

ZIP codes in Cayey

0073612b
55 to 60 °F
0073712a
50 to 55 °F

Puerto Rico planting zones →

Questions about Cayey

What planting zone is Cayey, PR?

Cayey, PR is in USDA hardiness zones 12a to 12b on the 2023 map (12a: 50 to 55 °F; 12b: 55 to 60 °F).

What kind of onions grow in Cayey, PR?

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