From the YUA site:
20:15 (local time) Andy Heading wins a shortened 460 mile race
With temperatures expected to go down to – 61 tomorrow and “warmer” temperatures only arriving by Sunday it was decided to stop the race. We also took into consideration the progress Tom, Pearse, Klaus and Joachim have made in the last 24 hours. They managed to do roughly 17 miles in that period of time.
Checkout the Yukon Arctic Ultra for the full post and photos on the gallery.