Smoke Point Walnut Oil : Fat smoke point °f unrefined canola oil 225°f unrefined flaxseed oil 225°f unrefined safflower oil 225°f unrefined sunflower oil 225°f unrefined corn 400°f semirefined walnut oil 400°f extra virgin olive oil 405°f sesame oil 410°f cottonseed oil 420°f grapeseed oil 420°f virgin olive oil 420°f.