Everyone is different but weight lifting raises most people's blood sugar. The reason for this is because of the type of activity it is. Weight lifting uses short term energy sources (ATP and CP). Similarly if you do 10 seconds of jumping jacks or sprinting at maximum effort it will often raise blood sugar as well. Its the maximum effort for 10 seconds or less that causes the raise.

Be aware that if you weight train you build more muscle which burns more calories for hours after your workout ends. That's why you want to lift weights. Usually the effect is that you will also require less insulin throughout the day. You'll have to test for yourself to see what kind of effect it has on you.

I lift because lifting and hot yoga are the only two activities I have found that don't cause me to go low. And lifting to,me is way more fun than yoga. I lift first thing in the morning. I eat 30g protein in the form of a protein shake before I lift. I take no insulin with the shake which has no carbs. I then take half a unit during the last 15 minutes of my workout or as soon as I am finished working out because I know that as soon as I finish I'll start rising. I then take a shower and eat a real food breakfast when I am done as I find I am usually starving. Good luck!

Curious if you cover that post-lifting meal with usual insulin-to-carb dose or if you take less for that one?

Wow, what a great idea! I have never thought to have a drink before lifting!

Vicki, I usually bolus the usual amount to cover my post lifting meal. Meaning I don't adjust my settings to compensate at all. You'll have to see what works for you. I eat because I am hungry after a session not because of fear of going low.