Welcome to the forum.
6 months *could* be long enough but a lot of that depends on where you are with respect to swimming and biking (if you are ready to run a 5k then you are all set for the run leg of any sprint-distance or shorter triathlon).
The winter months are a great time to really work on getting your swimming up to speed (pardon the pun). Start off by simply getting comfortable in the water and getting to a point where you can swim 500m non-stop. Remember, though that unlike running and cycling, swimming is all about technique so you won't really get any faster as you build endurance. For that, you need to do drills and, ideally, have a coach watch your technique and provide feedback.
As for cycling, there are many ways to get in some good base training over the winter. If you have an indoor trainer you can set your bike up on, you're all set. If not, you can always resort to spin bikes or stationary bikes (either at home or in a gym). They will let you get some saddle time although they won't be quite as good as riding your own bike (you won't be able to replicate the same position that you have on your bike).
So the short answer (too late!) is: Yes. You can train yourself in 6 months to be ready for a Try-A-Tri or even a Sprint Tri.
Here's a free 27-week training program for a Sprint level triathlon: opentri-training.com/free/sprint/index.htm
There are many others available on the net if this one doesn't look good to you.
Edited by: CROPTOP at: 10/9/2009 (14:16)
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