Patch 5.11 Maintenance Schedule for All Regions

On 06/10/2015, starting at 01:30 PDT, ranked queues will be disabled in preparation
for patch 5,11. At 03:00 PDT ,the servers will be shut down and all games currently in
progress will end in a draw and stats will not be recorded.It is estimated that the battlefields remain offline for 6 hours

And here is the schedule for the other regions:
[EUW] 03:30 GMT -05:00 GMT
[EUNE] 00:30 GMT - 02:00 GMT
[OCE] 02:30 AM AEDT-04:00 AM AEDT (June 11th)
[LAS] 04:00 (AR/UY/CL),02:00 (BO)
[LAN] 04:00 (MX/CO/PE),04:30 (VE)
[BR] 03:30 do horário de Brasília (06:30UTC)-05:00 do horário de Brasília (08:00 UTC)
[TR] 03:30 TSI (00:30 UTC) - 05:00 TSI (02:00 UTC)
[RU] 00:30 (21:30 UTC)= 02:00 (23:00 UTC)

Free week of this week(June 9th to 16th)

                               The following Champions will be free-to-play until June 16th: