GreenlyGardening in Puerto Rico: climate, frost dates and crops by region
None of the 4 cities of Puerto Rico on this page had frost in 2016–2025, so gardens there follow warmth and rain rather than frost dates. The warmest month averages 31.9 °C by day in Ponce and 30.6 °C in San Juan (Puerto Rico).
Climate zones of Puerto Rico
By the days between the last spring frost and the first autumn frost.
| Zone | Cities | Frost-free days | Last spring frost | First autumn frost |
|---|---|---|---|---|
| No frost in ten years | San Juan (Puerto Rico), Arecibo, Mayagüez, Ponce | — | — | — |
How the regions of Puerto Rico differ
Arecibo is the wettest of these cities with 1,236 mm a year, Ponce the driest with 930 mm.
Which crops suit which part of Puerto Rico
Cities without a spring frost: months that suit each crop
Months whose average day is not above the highest temperature on the plant card and whose average night is not below its lowest.
| City | Tomato | Cucumber | Bell Pepper | Eggplant | Watermelon |
|---|---|---|---|---|---|
| San Juan (Puerto Rico) | none | all year | November–May | November–April | all year |
| Arecibo | none | all year | November–April | December–March | all year |
| Mayagüez | none | all year | November–April | none | all year |
| Ponce | none | all year | October–April | January | all year |
Cities of Puerto Rico: weather in numbers
| City | Frost-free days | Warmest month, day | Coldest month, night | Rain a year | Driest month | Places to buy |
|---|---|---|---|---|---|---|
| San Juan (Puerto Rico) | no frost | September, 30.6 °C | February, 22.8 °C | 1,203 mm | June | 26 |
| Arecibo | no frost | August, 31.6 °C | February, 21 °C | 1,236 mm | December | 1 |
| Mayagüez | no frost | July, 31.7 °C | February, 21.6 °C | 1,130 mm | January | 3 |
| Ponce | no frost | July, 31.9 °C | January, 21.9 °C | 930 mm | January | 2 |
ERA5 2016–2025 via Open-Meteo, 25 km grid cell of each city; dates by the Greenly calendar and the plant cards.
