My weights are out in the unheated garage. I've been on the 5/3/1 program for about 10 months and wish to continue through the winter, does anyone have any advice for training in a COLD environment? My routine is squats, bench press, dead lift and overhead presses (plus some side exercises). I'm expecting temps between -5 to 35f.
I also have my weight room in the garage. Despite how cold it is outside, the garage doesn't reach the same extremes as the outdoor temperatures--but it is still cold. The biggest issue is the steel bar and weights which never quite seem to warm up. That said, there are some things you can do to deal with the cold:
I'll be honest, training in the cold is not fun. Keep the duration short and focused, but get everything done. 5/3/1 will probably be about 1 hour in the garage, 45 minutes if you really compress things. Minimizing rest times will help your conditioning, so you may not have to do anything specific for that.
To answer your question I will share some personal experience. There was a period of my life when I did boxing in a gym with no heating. The temperature was approximately -5 Fahrenheit outside and not much warmer inside(since there was never heating inside you can imagine how that felt). At the same time I was doing gymnastics in a gym with barely any heating.
As you know boxing is a sport that keeps you very active, where you constantly move, hopping around throwing punches. I and the other athletes there would sweat a lot but we could still feel the cold. At the beginning it was fine but I started feeling stiff at one point. So one day at the boxing gym(we had dumbbells, plates and bars) I was working out my triceps and managed to injure them like never before on one of the lifts. Tendonitis. They got seriously inflamed over a weight that I had previously lifted often in my life. My biceps' tendons got inflamed as well during gymnastics training.
As a result I had to seek medical help to get better and warm environment for my strength workouts and spend extra time warming up my elbows and shoulders. It's been 4 years now and I still have to make sure my room is very warm, that I have warmed up very good before I start getting into serious exercises on the rings. Thus I don't believe in workouts in extremely cold environment. There is a point past which no warming up will save you from the injuries cold will predispose you to.