There have been some larger men and at least one woman who was close to that weight when they started. Honestly, it could take you longer than 9 weeks, as you might want to repeat some days/weeks. You will still be able to run a 5k at the end of it.

Can you walk for 30 minutes right now?

You may need to adjust the program but, yes, you'll be able to run 30 minutes by the time you finish it. It'll take a bit longer to actually run 5K. Not many can do that by the end of the program but we could run 30 minutes and that's a big accomplishment.

Can you walk 30 minutes now? If not, perhaps do the program as a walking program for a few weeks (or completely). Walk a normal pace during the "walk" portions and a faster pace during the "run" portions.

If you can already walk 30 minutes, start the program. Run slow. As slow as you can. Just make it through the day's training session. You may need to repeat a few days or a week here and again but you will be able to do this.

You may not be at a 5K distance if you complete the program. A lot of people (myself included) could RUN for 30 without stopping by the time they finished, but not everyone can run fast enough to get to a 5K distance.
I've done C25K twice (first exclusively on the treadmill (no incline), then again, but outside. That was a few months ago and I still can't run fast "enough" to compete it in 30 minutes, but that's OK... I can run up to 4 miles outside, though!

Just remember: You can repeat days and entire weeks of the program if you need to! And always go slower than you think you can. Good luck to you :-) And get properly fitted shoes from a running store.

I am currently around 350 and I am in week 9. I was about 370 when I started. I have not had a need to repeat any of the weeks (of course, YMMV). I kept everything slow as the point of the program is to build up stamina.

A couple things I would like to note however. I preceded starting c25k by building up to being able to walk 10k steps per day. I was walking 10k steps per day and was walking 5k at least once per week when I started. Also, I am slow. My running pace is slightly faster than my walking. Even though I am almost done with the program, I have more work to do. At my pace, I'm looking at 50-60 minutes to complete a 5k.

Hope this helps.

Can you walk for 30 minutes right now?

Honestly I don't know. I haven't tried. I'm a true couch potato. I think I could do a slow pace walk. I saw it begins with a 30 second jog with a 90 second walk , for 20 minutes total. I think that is possible.

If you can do that, you can do the program.

That's what we are here for.

Just to let you know: I was 215 when I started last year. EVERYTHING jiggled and sloshed and bounced when I started moving. I was so ASHAMED to put that out in the street. I had all sorts of negative self-thoughts like "My neighbors will think that I'm going to do this for two weeks and then quit." or "They are laughing at me behind their curtains."

Instead, my neighbors were encouraging - one would cheer as I lumbered by. They described me as "inspirational." The only person who was negative about my goals was...me. I NEVER thought I would even be able to complete the C25k program. I started it expecting to fail. I am the polar opposite of a "runner."

The very hardest day of the program was Day One. And the hardest part of day one was tying my shoes. Don't put it off.

For me...it's a year later. I run three days a week. I've run a half marathon. I actually (and I still can't believe it because I'm not that fast) placed third in my age group during a trail race last Saturday. I'm 175 pounds that is steadily becoming firmer and stronger.

I would have achieved none of that if the me of a year ago had never gotten around to opening my front door. What will the you of 2015 thank you for doing today?