Puerto Rico frost dates

Most of Puerto Rico’s climate stations rarely or never record a freeze.

“Median” dates have a 50% chance of a later spring frost or an earlier fall frost. “10% risk” dates are the safer choice for tender plants: only 1 year in 10 has frost beyond them. Source: NOAA NCEI 1991–2020 Climate Normals. Elevation matters: within a state, frost dates can differ by a month or more between valleys and hills.

Station	Elevation	Last frost (median)
Adjuntas Substn	1,830 ft	Rarely freezes (32°F in 0% of years)
Aguirre	25 ft	Rarely freezes (32°F in 0% of years)
Aibonito 1 S	2,330 ft	Rarely freezes (32°F in 0% of years)
Arecibo Obsy	1,060 ft	Rarely freezes (32°F in 0% of years)
Borinquen AP	218 ft	Rarely freezes (32°F in 0% of years)
Coloso	40 ft	Rarely freezes (32°F in 0% of years)
Dorado 2 Wnw	5 ft	Rarely freezes (32°F in 0% of years)
Dos Bocas	200 ft	Rarely freezes (32°F in 0% of years)
Guayama 2E	72 ft	Rarely freezes (32°F in 0% of years)
Gurabo Substn	160 ft	Rarely freezes (32°F in 0% of years)
Isabela Substn	420 ft	Rarely freezes (32°F in 0% of years)
Juncos 1 Se	213 ft	Rarely freezes (32°F in 0% of years)
Lajas Substn	90 ft	Rarely freezes (32°F in 0% of years)
Magueyes Is	12 ft	Rarely freezes (32°F in 0% of years)
Manati 2 E	250 ft	Rarely freezes (32°F in 0% of years)
Maricao 2 Ssw	2,832 ft	Rarely freezes (32°F in 0% of years)
Mayaguez City	74 ft	Rarely freezes (32°F in 0% of years)
Mona Island 2	7 ft	Rarely freezes (32°F in 0% of years)
Palmarejo Vega Baja	560 ft	Rarely freezes (32°F in 0% of years)
Pico Del Este	3,448 ft	Rarely freezes (32°F in 0% of years)
Ponce 4 E	70 ft	Rarely freezes (32°F in 0% of years)
Rio Piedras Exp Stn	92 ft	Rarely freezes (32°F in 0% of years)
Roosevelt Roads	33 ft	Rarely freezes (32°F in 0% of years)
San Juan L M Marin AP	9 ft	Rarely freezes (32°F in 0% of years)
Toa Baja Levittown	28 ft	Rarely freezes (32°F in 0% of years)
Trujillo Alto 2 Ssw	115 ft	Rarely freezes (32°F in 0% of years)
Wfo San Juan	10 ft	Rarely freezes (32°F in 0% of years)