I think it halves at block 408,000. Coinwarz currently has it at 399,719.
8,000 blocks till halving@ 3 minutes per block is 16.67 days. I believe blocks are coming in a little quicker than 3 mins(does anyone have a number for that?) so it will happen even sooner than that.

102,000
204,000
306,000
408,000
510,000
612,000

every 102,000 blocks
gotta a little more time to prepare!