When do 2017 lease programs end?

I am considering leasing a 2017 VW GTI or Mazda3. There is plenty of 2017 inventory on the lots for these cars. When do the manufacturers stop offering the lease program for model-year 2017?

This occurs to me because: I remember in 2016 I was looking at leasing a left-over 2015 3-series, and a dealer told me that the manufacturer was no longer doing leases on last year’s car. Or, I forget, maybe BMW Financial was still doing leases on the 2015, but without incentives.