How far is too far to travel to drill? Are there any regulations pertaining to driving distance?

I've know guys who moved out of the state and still flew in on drill weekends. I believe they were in the process of transferring to another, closer unit but until then, they were expected to show up. Your COC might be able to help some but I don't think there's any regulation regarding driving distance. Like with anything else in the Army, you have to be in certain places at appointed times. It's your job to make sure you're there. You might look into changing MOS' in order to find a closer unit to drill with. Just a thought. Good luck.

SPC(P) (Join to see) National Guard is a little more complicated than USAR as there is technically no requirement to limit travel like the USAR has. If this is causing a legitimate financial hardship or a work conflict, I recommend reaching out to your CoC. They will likely be accommodating if you can provide a documented reason why this is difficult for you. However, RST is an option. Find a unit nearby and determine if they will let you drill there. Then work with your CoC to coordinate. Make sure that you provide your chain with options. They're more likely to approve something if they have options versus an ultimatum. Best of luck!

Went through this myself. Moved from AL to CA while in an AL ANG unit. The move was my choice. Traveling from CA to AL for drills was too much. Wound up speaking with my Commander about it and started hunting a unit in CA. Eventually I was fortunate enough to earn my current position otherwise would have retired.
My advice would be to have open and honest communication with your leadership, and find a position closer to where you are. You may have to change MOS, or even service branch to make it work for you.