Early this week, my 6-year-old decided that he wanted to do Parkrun this week. There are no junior events here, so that meant doing the full 5 K. I was a bit worried about the conditions, but luckily it was 4 degrees and mostly dry, with a few icy patches. And he completed it! We had warned the Parkrun team in advance, and the tail walker took good care of him. He mostly walked, but I think that finishing in 1:02 isn't too bad for such a little boy.
Of course, now he says he never wants to do it again...