Looking for a source of long straw for crafting near Denver, CO

I want to try making a straw hat, but I'm having trouble finding straw. Straw that has gone through a combine isn't useable, and most modern varieties have very short stalks. If anyone knows of a source, or is growing grain for a food or cover crop and would be willing to part with some straw, please let me know!

If you don't need huge amounts suggest looking in your local highway right of ways.  In our area one of the things the reclamation crews have been planting along the highways is a really tall bunch grass.