Guess it depends on how much elevation you've been doing in training then, can be tough if you're not used to it. But should be doable if you make sure to keep moving. Run what you can, hike what you have to, that's my ultra motto. Even small runnable sections, where you might be inclined to take a lil break and keep hiking it, go ahead and run it, every lil bit of time adds up when you're chasing cutoffs.