See if there is an email contact on the web site and email them to say you are joining them at their run. I joined one a few years ago and they were very welcoming. There was one guy who seemed leary of my sister and I (we joined the group in January) I think once he realized we weren't just New Year's Resolutioners, he got more friendly.
The woman who runs the group was very friendly and responded to my email. When my sister and I got there, she hung back to "jog" with us and get to know us. As we continued running we the group, she ran on ahead.
I find runners to be very welcoming people. And very supportive!
"I'd rather waltz than just walk through the forrest"
- Sprint Triathlon: 9/11/2011
- Half Marathon: 9/18/2011
- Weigh under 210: GOAL!!! As of 7/16/2010
- Next goal: Get BACK to under 210