Unfortunately this is the first year I won't be participating but best of luck! The Montana Spartan is a great race that has amazing support. Which race are you doing, sprint or beast? Training for a 50 mile mountain bike race this year, otherwise I would be there. As long as you've been training and are aware of your surroundings you should be just fine. I never worried about injuries.
Spartan race was AWESOME! Had so much fun participating in one of the most grueling physical challenges of my life. Kind of like back-country elk hunting! I recommend these races for anyone looking to test their metal.