The decision calls time on a 16-year playing career with both County and Inverness Caledonian Thistle, and Munro insisted it had been his choice to leave, dismissing speculation of a fall-out with manager Derek Adams.
The defender - who made more than 400 appearances for the Highlands' big two - admitted he knew his time at the top end of the Scottish game had drawn to a close. Munro was dropped for County's last two matches following an erratic display in the 4-2 defeat at home to Dundee United.
The news came as something of a surprise, since last season had been arguably one of the best of his career, as he forged a formidable partnership with Scott Boyd. Having already earmarked next summer as his likely exit, though, Inverness-born Munro decided it was time to bite the bullet and look to the future.
"I approached the manager and said I felt my time at the club was up," he said. "And fair play, he didn't stand in my way. I have to thank him and George [Adams, director of football] for that. They could easily have said 'no'. I'm leaving them in the lurch a bit with the transfer window not opening until January, but Derek said he wouldn't stand in my way if that was how I felt.
"There was no fall-out. People will want to read that into it, but there was no problem. It was my decision. It has always been in my mind what I'm going to do next and I came to the conclusion it was time to go now.
"There was always a chance this would be my last season at this level, anyway. Going now gives me a few months headstart, rather than be scrambling about for something come next summer. I've got thoughts on what I want to do. My wife and I have another kid coming in December, so it's important I make the right decision. Whatever I choose to do now is for the next 25-30 years, so it's got to be right for myself and my family."
Since announcing his decision, Munro has had interest from "one or two" full-time clubs, but believes his future lies in part-time football and full-time employment outside the game. "I need to think very carefully about my next move," he admitted.
"My life has been played out in two parts, really. I've had the football part for 16 years now and I need to get the next bit right now for myself and the family. I'm very fortunate because the phone has been busy, both with football offers and with people wanting to meet to discuss work opportunities outside football. It's nice that people hold me in that high regard."
Munro won three First Division title medals - two at Inverness and one with County - before helping the Dingwall club to a heady fifth place in their debut top-flight season. He was always an unlikely County hero, having supported the old Caledonian in the Highland League and joined the merged club's youth set-up at 13.
He then emerged as a cult hero at Inverness, famously subduing Henrik Larsson in a 1-0 Scottish Cup victory over Martin O'Neill's Celtic in March 2003. Munro, latterly Inverness captain, went on to taste victory over both halves of the Old Firm, but was allowed to leave by Terry Butcher in summer 2011.
"I've enjoyed every minute of it," he admitted. "It has been an honour to play at this level for two great clubs, alongside some great players. If you look back career-wise, there were a lot of highs but last year was right up there. Finishing fifth was an unbelievable achievement for the club and it was great to be part of it.
"I like to think I had a good rapport and closeness with both sets of fans. I'm proud of my contribution and I'd like to thank everyone at Ross County for a fantastic two years. I never dreamed I would go and play for Ross County, but it happened - and what an amazing ride I found myself on there as well."