In the bottom of a bowl, whisk together olive oil, lemon juice, salt, pepper, and honey.
Add in kale and toss until coated in dressing. Top with grapes and refrigerate for 1-2 hours to allow kale to soften (can make this part the day before if desired).
Before serving, toast walnuts in a dry, non-stick pan over medium heat until lightly golden brown, about 5 minutes. Top kale salad with walnuts and blue cheese. Enjoy!