Costa Rica: frost dates by city

The average last spring frost and first autumn frost in Costa Rica, from ten years of weather.

City	Last spring frost	First autumn frost	Frost-free days	Soil at 10 °C	Tomato: planting out	Places to buy (OpenStreetMap)
Liberia	none in ten years	none in ten years	—	already in the first week of January	—	5
Limón	none in ten years	none in ten years	—	already in the first week of January	—	3
Puntarenas	none in ten years	none in ten years	—	already in the first week of January	—	4
San Isidro de El General	none in ten years	none in ten years	—	already in the first week of January	—	12
San José	none in ten years	none in ten years	—	already in the first week of January	—	57

Places: © OpenStreetMap contributors, ODbL.

Gardening in Costa Rica: climate zones and crops by region

Median of 2016–2025 for the 25 km grid cell of the city: the last day at or below 0 °C in spring and the first in autumn (ERA5 reanalysis via Open-Meteo). In a cold year a frost can come a week or two later — Greenly warns 48 hours ahead.