Don't forget we had a freak of nature last year, 75 degree weather in march. I was curious myself and pulled this off of the history:

45142 | 474A1622 | 42 44.2 N | | 3D08 | | | E: Buoy deployed successfully at |
| Port Colborne | 33E | 79 17.4 N | 1 0 1 0 1 1 1 | | | | 1930Z, 20 May 2011. |

So according to their historical data 2 years ago it wasn't deployed until may 20th

Any day now I think