Seattle Parks and Recreation Community Centers offer indoor play areas for toddlers. Choose from 18 different community centers throughout Seattle.
Our local rec toddler indoor play area has been a lifesaver on a cold, rainy winters day. It's a cheap alternative to the Seattle Gymnastics Academy, although maybe not as fun to jump around in. They have toddler bikes, loads of balls, and a few other toys to keep little legs entertained until nap time.
Most of my life is spent doing activities within walking distance of my home, but when I have the car and am mobile, we make a beeline for the Seattle Parks & Recreation play areas. I love these- they're indoors, so we're warm and dry, they're affordable (usually a couple of dollars per kid), and there are lots of toys to play with and thing to climb on. The spaces aren't so huge that my kids are ever too far away, so I can sit and watch them play and keep an eye on them while they explore.
Our two closest playrooms are the ones in Ballard and at Green Lake. The Green Lake playroom is considerably larger than the one in Ballard, and has a bathroom there in the room. The Ballard space is smaller, so does fill up quickly.
We also spent time at the newer Northgate Community Center. This is a huge space with tons of play equipment. When we went there were lots of kids there, but it still didn't feel too overcrowded. Parking is a challenge at this location, as the lot is small and is shared with the library (next door). Some people park over at the mall and walk across the street when there isn't enough parking at the center itself. Bathrooms are just outside the main playroom; also outside the main room are tables for snacking/lunching.
Stuck in Seattle from Sept to late May on a rainy day with toddlers? Exhausted the indoor spots at the Children's Musuems, Zoo or Science Center? Visit the indoor play spaces at the various community centers in Seattle.
Many of them have playgrounds next door (Hiawatha, Rainer, Delridge, High Point, Miller Park) and some have bouncy castles inside as well as an array of climbers, ridey toys and other toys. Babies to 4 year olds is the age range, older kids need to be closely monitored by caregivers.
Check out your nearest local community center. They probably have an indoor toddler play area. We live near Green Lake, and theirs is $2/kid entrance fee and has a few small climbers/slides, a playhouse, several ride-on toys, a big mat, and a few benches for parents to sit. Fairly clean, and a handy elevator leads you upstairs to it. There's a small bathroom and kid-level sink for keeping sanitary. Have fun!