Shifter:

I have climbed it, and would suggest without question that you plan to get to Westport and spend the night first -- especially in October, which is when I was there last year.

As far as public transportation, this is what I saw posted:

If you're relying on public transport for a day-trip to Croagh Patrick, Thursday (the main shopping day in Westport) is the best day to attempt the climb, with three or four buses in each direction; Tuesdays and Saturdays are also possible, but you won't be able to dawdle on the mountain if you're going to make the bus back.

With light an issue at that time of the year, I would not try to pull this off without a fresh start from Westport -- just five miles from there -- in the morning. That being said, you are in for a heck of an experience.  The view is incredible.

There is a nice page on the visitor's center available here.

Have a great time -- it is a interesting vantage point to see the bay and surrounding area.

Geno

 

-- Edited by Geno on Monday 23rd of July 2012 01:49:48 PM

If you are driving then there is no harm heading up from Ashford and Cong.  However if you want a night with a bit of life and locals then Westport is a good option. I am sure Michele will have recommendations for accommodation. however St Anthony's or Augusta Lodge may suit

http://st-anthonys.com/
http://www.augustalodge.ie/

-- Edited by tony2phones on Wednesday 8th of August 2012 09:19:30 AM

You can also get a cab from Westport to Croagh Patrick and ring the driver from the visitor centre for pick up.

I would definitely recommend an overnight in Westport.

When I stayed at the Clew Bay Hotel, they offered a free shuttle if you booked two nights with them. Most accommodations in Westport are happy to help guests work out transportation to Croagh Patrick.