Of 29 dark-sky places and national parks in Greece, Samaria National Park (of those darker than half of Europe’s land) has the most clear, moonless hours of full darkness: 758 a year (ERA5, 2006–2025). The darkest sky is at Samaria National Park, darker than 77% of Europe’s land (NASA VIIRS 2025).
Climate, not a forecast: these are shares of past nights (ERA5 reanalysis, 2006–2025), not a prediction for a particular night. Check a forecast before you go.