The last frost in Ystrad Mynach, Wales was the night of the Monday 08/03/2021 to Tuesday 09/03/2021, with a minimum air temperature of 1.0°C (33.8°F), and therefore a probable minimum ground temperature of around -2.0°C (28.4°F).
There are no frosts forecast for Ystrad Mynach in the next 5-days.