I do have some hills, but they take considerably more time for me to get to. Which means needing more travel time and I'm not sure I will have time to spare this Winter and Spring.

Here is the "why":
I have a 150 mile ride in early June that I am beginning to prep for now (it is my first, so far my max ride has been around 50 miles) and I know there are larger/more rolling hills on the planned ride route than I can usually access in my immediate area.

Does anyone have suggestions for how I can better train for hills without actually getting on them consistently? Once the time changes again I can probably squeak in more rides (traveling to hilly routes) but until then I want to do something other than worry.

Seriously, I had my butt handed to me on a 25 mile training ride and thought I was going to die - okay, it wasn't THAT bad - multiple times all because of the darn hills coupled with some serious speed riding. I really need to improve! It didn't help that I put myself in the 14 - 16 mph group and we consistently were at 18, 19 and 20 mph. 27 - 31 going downhill. I know for the "real" ride I'll be setting my own speed and not worrying about anyone else.