Two deadlines in Ryan Dahl's blog post matter to anyone who has built on Deno: one in six months, one in a year.
Fact
The facts: on 9 October 2026 Ryan Dahl announced on the Deno blog that the entire Deno team is joining Cloudflare. Cloudflare published a joint post the same day by Dahl, now a Senior Principal Engineer there, and Kenton Varda. Both texts say "joining", and neither says a word about deal terms or amounts. The Cloudflare blog files the post under the Acquisitions tag. Specifically, per the Deno blog: the Deno runtime gets another year of support with monthly releases containing bug fixes and security updates, after which Deno ends its development; it remains open source and Deno welcomes anyone who wants to continue it. Deno Deploy keeps operating for six months and then shuts down, and paying customers get migration support to Cloudflare Workers. JSR continues, with its infrastructure moving to Cloudflare. Deno continues to support rusty_v8 and works toward integrating it into workerd. Per the Cloudflare post, the two teams are merging celld, which Deno released in August, and workerd, the open source runtime of Workers; Dahl and Bert Belder will lead an effort to make self-hosting workerd a first-class supported way to run apps. Cloudflare promises more announcements in the coming months.
The first deadline is for Deno Deploy, the company's hosting. In six months it shuts down. The announcement gives no exact date, so you count from 9 October and leave some air. Migration help to Cloudflare Workers, per the announcement, is promised only to paying customers.
The second is for the runtime. A year of monthly releases with bug fixes and patched holes, then Deno stops developing it. The code stays open and Dahl invites others to continue it. Whether anyone will take it on is not known yet.
Why they are doing it, Dahl explains with a chain: Deno, then Deno Deploy, then celld. Deploy showed him how complicated cloud infrastructure can get, so celld is a single Rust binary whose only external dependency is object storage. The goal is for the Workers model with Durable Objects, small servers with their own SQLite database, to run on your own infrastructure too. Cloudflare does not hide why it needs help: workerd is open source, but Durable Objects there run only as a single instance, and the company admits it never got around to fixing that for self-hosting.
The hosting has six months. The runtime has a year.
Open the list of your projects and mark which ones run on Deno Deploy. They have a deadline, the rest have time.
Official primary sources
Deno - Deno is joining Cloudflare, 09.10.2026Cloudflare - Deno is joining Cloudflare, 09.10.2026The visual is generated code-art, no third-party images.