How often should I check on my retirement investments?

Once a year is plenty. That's when you should make sure your asset allocation still makes sense for your age, and perhaps sell certain investments that have grown so big that your target allocation is out of whack. Reinvest the money in order to bring your asset allocation back where you want it.

One nice benefit of rebalancing like this is that it forces you to do what so many investors fail to do: Buy low and sell high. To top of page