Staff-to-child ratios in Washington daycares
Ratios are the #1 structural quality lever in child care: they set how much attention, language and lap time each child can possibly get, and they're the main reason care costs what it does. These are Washington's licensed maximums for centers — a program may always staff better than this, and the good ones do.
The licensed maximums (centers)
| Age group | Max ratio | Max group size | Alternative |
|---|---|---|---|
| Infants (birth–11 months) | 1:4 | 8 | or 1:3 with a group of 9 |
| Toddlers (12–29 months) | 1:7 | 14 | or 1:5 with a group of 15 |
| Preschool (30 months–6 years) | 1:10 | 20 | — |
| School-age (5–12, in school) | 1:15 | 30 | — |
Source: WAC 110-300-0356(5), Washington's licensing rule for child care centers. Licensed family homes follow different limits (WAC 110-300-0355). Centers may combine age groups for up to two hours at open and close if the youngest child's ratio and group size are kept.
Why the ratio is the price
Every infant seat obligates a quarter of a caregiver; every preschool seat a tenth. That 2.5× difference in labor is almost exactly the difference you see in Seattle tuition by age — and it's why tuition drops at each room transition, and why "cheap infant care" should make you ask what corner is being cut.
How to check on a tour
- Count heads, twice. Adults and children, in the room your child would join — once at drop-off, once late afternoon when staff shifts thin out. Compare to the table above.
- Ask the ratio at 5pm, not just at 10am. End-of-day combining is legal for up to two hours; you want to know what it looks like in practice.
- Ask how breaks are covered. Lunch and breaks need floaters; a program with no floater answer runs out of ratio when someone sneezes.
- A program beating the required ratio — 1:3 infants, 1:8 preschool — is investing where it matters most. It will usually tell you so; if the tour guide doesn't know the room's ratio, that's a finding too.
Ratio is one of the ten tour questions made visible: you don't have to ask permission to count.
Quick answers
What is the infant ratio for daycares in Washington state?
One staff member to four infants (1:4) with a maximum group of eight, or 1:3 with a group of nine — WAC 110-300-0356(5), for licensed child care centers. Infants are children from birth through 11 months.
What are the toddler and preschool ratios in Washington?
Toddlers (12–29 months): 1:7 with a group up to 14, or 1:5 with a group of 15. Preschool age (30 months through six years, not in kindergarten): 1:10 with a group up to 20. School-age (5–12, in school): 1:15 with a group up to 30.
Are these ratios the same at in-home (family) daycares?
No — licensed family homes follow different limits (WAC 110-300-0355) that depend on the mix of ages present and the licensee’s qualifications. The table on this page is the rule for licensed centers.
Is a program allowed to mix age groups?
Briefly, yes — centers may combine ages for up to two hours at the start and end of the day, but must keep the youngest child’s ratio and group size during that time.