I know I’d be seriously undertrained, but I can’t find anything about offical cutoff times on the Web site, so presumably I could muddle along until finished.
Here’s a sample of how trained you should be, from beginnertriathlete.com:
You already know how to run [ha!], so you must work in the biking and swimming while only increasing in these events by no more than 10% a week. Once you have gotten up to 20min swim (forward crawl - no stopping), 30min bike, and 20min run, then you may start the final 13 week program. Getting up to these levels might take a month or several depending what you are strong in. Be patient. Swimming might take the longest. Once you have achieved these levels, it is usually a good idea to sustain them for a month or so before going on into the final 13-week sprint training program.
My own training level is that I swim about 600 years in an average training session, with plenty of stops and rests, I can run/walk three miles in possibly 45 minutes or so; and I think biking 20 miles is a long way. I haven’t biked all winter. And it’s in four weeks.
On the other hand, it would be an experience. The swim is around the central pond of the Dunes marina. Water temperatures would be only around 15 degrees C., so I’d need a wetsuit. It could be done.
And thousands of seabirds spend the winter in this estuary, so I’d have to practice not swallowing any water.