I just fractured both my heels by hitting the knuckle on jump 4 in Freeway, Breckenridge. It was my 3rd run through and I didnt know something was up till the very last minute. I don't know if there was a gust of wind, a change in snow temperature or even a miscalculation on my part but I definitely paid the price.
You never know what external factors may be in play so if in doubt, pull out and enjoy a full winter season. Play is safe out there.