Kids has to be 4 yrs or older (by January) ,to send them JK (Juniot Kinder garden) in that year. Most of the schools are government schools, maintained by different school boards.
For less tahn 4 yrs old, you can send them to day care centers, which are owned by private people and bit costlier ($300/wk).
Most schools are public, there are some private schools but you have to pay huge fees for them.
For Children less than 4 years, day care centre and early age learning centre is an option. For early age centre, parent should accompany the child, you can not leave your child there.