There are lots of options when it comes to working with wood outside. Some species are naturally rot resistant, while other chemical treatments can help extend the life of the wood.
But, there is a process by which wood is treated with heat – much higher than experienced in a drying kiln – that changes the wood’s structure, making it exceptionally rot-resistant.
So, if you are looking to build an outdoor project, the folks at Thermo-Treated Wood have this information page on their product and where it can be purchased.