Hello, I am trying to Identify a tree from my yard. We moved here 2 years ago and this is the first year I have found nuts on it. It looks like a chestnut but which variety. The nut in the photo is about 1" in diameter. Thanks, Mark Spavin
Olmsted County Minnesota
It looks like a buckeye -- also known as horse chestnut. The scientific name is Aesculus glabra and it is commonly called Ohio buckeye or American buckeye. You can check out information online and also see the "Aesculus glabra Range Map" (PDF). There is also the red buckeye, Aesculus pavia, commonly used as an ornamental.
Hope this helps,