For anyone unfamiliar with the bold north, biking or walking on water is a fun outdoor winter activity when incorporating a few ice safety tips into the adventure. Mother Nature’s temperature swings in the upper Midwest will determine when to venture onto a frozen body of water safely. From mid to late December through February, riding a bike across a body of frozen water is a regular occurrence. This year. please take note. With above-normal temps so far this year, ice is slow to form. Delaying many of the fun activities here on many of the lakes and streams. Remember to check the ice depth before you venture out!