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

Planting zone for 00737 — Cayey, PR

ZIP code 00737 (Cayey, Cayey County) is in USDA zone 12a: the coldest winter night averages 50 to 55 °F.

Where ZIP 00737 is

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.

Zone12a50 to 55 °F
Coldest night10 to 12.8 °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 12a means →

Frost forecast — next 7 nights

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Loading the forecast for Cayey, 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: Cayey, PR is in zone 12a, 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.

Soil in Cayey, PR

The soil mapped at the center of ZIP 00737 is Mucara — clay, well drained. Much of the area is built over (urban land); this is the natural soil underneath.

TextureClayholds water and nutrients; slow to drain and warm up
pH5.8moderately acidic; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter4.6%moderate
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Urban land-Mucara complex, 12 to 40 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 00737; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Cayey, PR

Longest day13 h 13 mindaylight on June 21
Shortest day11 h 02 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

8 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

0073612b
Cayey, PR · 1 mi
0073912b
Cidra, PR · 4 mi
0078612b
La Plata, PR · 4 mi
0070512b
Aibonito, PR · 7 mi
0078413a
Guayama, PR · 7 mi
0078212b
Comerio, PR · 9 mi
0072712b
Caguas, PR · 9 mi
0078513a
Guayama, PR · 9 mi

All 2 ZIP codes in Cayey → · Puerto Rico planting zones →

Questions about 00737

What planting zone is ZIP code 00737?

ZIP code 00737 (Cayey, PR) is in USDA hardiness zone 12a on the 2023 map: the coldest night of an average winter reaches 50 to 55 °F (10 to 12.8 °C).

What kind of soil does 00737 have?

The USDA soil survey maps Mucara at the center of ZIP 00737: clay, well drained, pH about 5.8 (moderately acidic).

What kind of onions grow in Cayey, PR?

Short-day onions: the longest day near 00737 is 13 h 13 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.