Question
I live in the Kansas City, Missouri area.

I have some grass seed that is over 1 year old.  It has been stored in a dry container in my garage since I purchased it.  

Does that seed to bad, or should it still be ok to sow this fall.  I believe it is a blue grass, fescue mix.  

Answer
Check the lable on the bag. The packaging date is when the seeds were fresh. the longer you wait from the packing date the less viable seeds will you have. Normally, the recommendation is to store seeds maximum 6 months from packing date, and if you have to store seeds, then store them cold and dry (garage may be ok, but fridge would have been better).

I think you should go ahead and show seeds now. The soil temperatures are still warm but air temperatures are starting to cool. This is ideal for your new grass. DO not wait too long as late fall soil temperatures will be very cool and it will take longer and make it more difficult for grass plants to establish.

If you sow, sow thickly (maybe using 6-8 lbs per 1000 sq feet) to account for the likely lack in vigor.

Remember: good soil preparation, good soil/seed contact, and keeping seedbed moist until sprouting is required for best result.

Good luck.