Cron Builder for Cloudflare Workers Triggers
Quick Answer: Cloudflare Workers Cron Triggers use standard cron expressions configured in wrangler.toml under [triggers]. The cron syntax follows the standard 5-field format. Your Worker receives a scheduled event handler with the cron expression and timestamp.
Cron Expression
* * * * *
Plain English
every minute, of every hour
Next 5 Run Times
4/22/2026, 4:55:00 AM
4/22/2026, 4:56:00 AM
4/22/2026, 4:57:00 AM
4/22/2026, 4:58:00 AM
4/22/2026, 4:59:00 AM
FAQ
How do I add a cron trigger to my Cloudflare Worker?
In wrangler.toml: [triggers] crons = ["0 */6 * * *"]. In your Worker, export a scheduled handler: export default { async scheduled(event, env, ctx) { ... } }.
What are the limits for Cloudflare Worker crons?
Free plan: 5 cron triggers. Workers Paid plan: 250 cron triggers. Minimum interval is once per minute.