Bacteria that breaks down waste work best in warmer temperatures, this means an iced-over methane producing pond will likely slow down. While the ice acts as an insulating layer, which can help trap heat and gases underneath, the generally cold conditions will still reduce gas production somewhat.
Since methane can continue to form under the ice, pressure may build up if the gas cannot escape easily, so this should be promptly addressed. Additionally, if the pond is covered with a methane collection system, the ice could damage or block the cover, so it is important to monitor it during freezing weather.
