Early Start Denver Model (ESDM) delivered to children aged 18–30 months produced significant gains in IQ, adaptive behaviour, and autism severity — some children no longer met diagnostic criteria at follow-up

The Ontario reality
Understanding autism in Ontario means understanding this data.
Registered
89,799Children registered
Total in the Ontario Autism Program queue
MCCSS FOI · Mar 2026
Funded
20,633Have active funding
Only 23% of registered children
MCCSS FOI · Mar 2026
Waiting
69,166Still waiting
Registered. Diagnosed. Un-funded.
MCCSS FOI · Mar 2026
Verified , MCCSS FOI · Mar 2026
| Metric | Value |
|---|---|
| Children registered | 89,799 |
| Have active funding | 20,633 |
| Still waiting | 69,166 |
The province's autism program has long waitlists that force children to wait years for therapy. Despite an ASD diagnosis and eligibility, a child often cannot promptly access the intensive services they need. This amounts to a systemic delay in treatment.
Ontario's Financial Accountability Office reported that over 89,799children are registered with the OAP; 20,633 are enrolled in Core Clinical Services and 20,633 have active funding (Ontario Autism Coalition FOI, March 2026). 69,166 are still waiting, roughly 3 in 4 autistic children in the program are waiting, not funded.
Many families have been stuck in limbo for two, three, or even five+ years without the prescribed interventions. There are cases of children who were registered in 2019 or 2020 still waiting for therapy as of 2026.
Autism treatment is absolutely delayedin Ontario's public system. The combination of limited funding slots, a massive waitlist, and slow enrollment has created a scenario where thousands of children experience critical delays in care.
Families often have to either wait it out, seek stop-gap private services (if they can afford them), or watch as precious early development time slips away. The consensus from parents, advocates, and even government reports is that Ontario's autistic children are not receiving timely treatment, a situation that demands urgent remedy.
Written by Spencer Carroll
Founder & Autism Advocate
Evidence on this page
Key claims are paired with their source, evidence tier, and verification date so readers can inspect the public record directly.
Early Start Denver Model (ESDM) delivered to children aged 18–30 months produced significant gains in IQ, adaptive behaviour, and autism severity — some children no longer met diagnostic criteria at follow-up
Cochrane systematic review finds evidence that early intensive behavioural intervention (EIBI) may produce positive effects on adaptive behaviour and communication for young children with ASD (low certainty of evidence)
WHO recommends accessible, community-based early interventions for children with autism — timely evidence-based psychosocial interventions improve communication and social engagement
89,799
children are registered in the Ontario Autism Program
23%
Only 20,633 children have active funding agreements — less than one in four