The Full Beaver Moon

From the Farmers' Almanac:

Full Beaver Moon – November This was the time to set beaver traps before the swamps froze, to ensure a supply of warm winter furs. Another interpretation suggests that the name Full Beaver Moon comes from the fact that the beavers are now actively preparing for winter. It is sometimes also referred to as the Frosty Moon.

Here's the view even though it isn't technically full till after midnight.