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What WP-Cron does—and why it can run late
WP-Cron is WordPress’s built-in scheduler. WordPress core describes wp-cron.php as “A pseudo-cron daemon for scheduling WordPress tasks.” Unlike a system daemon that wakes at fixed times, WP-Cron is normally started when WordPress receives a web request. A page view causes WordPress to check its scheduled event queue and spawn the cron runner when work is due. The core implementation is documented in WordPress’s wp-cron.php source.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsThat visitor-triggered design avoids requiring shell access, but it ties execution to traffic. A site with few visits can leave a due event waiting until someone opens a page. A busy site may cause cron checks to occur during front-end requests, competing for PHP workers, memory or database time. The WordPress.com WP-Cron guide documents the same request-based behavior and the resulting delays on low-traffic sites.
Moving the trigger to the operating system gives you a timetable independent of visitors. It does not change the events registered by WordPress or plugins; it changes how WordPress is asked to process the queue.
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When a real cron job is the better choice
- Use a system scheduler when timing matters. Scheduled publishing, time-sensitive notifications, imports, subscription renewals, backups and queue processors are less dependent on someone visiting the site.
- Use it when front-end requests are costly. A scheduler can run under a defined operating-system account and at a cadence you choose, instead of allowing page requests to initiate checks.
- Keep visitor-triggered WP-Cron when you lack scheduler access. Shared hosting may not provide shell access, a control panel cron feature or permission to run PHP from the command line. In that case, disabling WP-Cron without an alternative creates a silent failure.
There is no universal “correct” interval. Select a cadence that meets the most time-sensitive event while staying within your host’s CPU, memory, process and request limits. Every-five-minute examples below are patterns to adapt, not a promise that five minutes suits every installation.
Disable WP-Cron safely in wp-config.php
Back up and locate the file
- Make a recoverable copy of
wp-config.phpbefore editing it. Store the backup somewhere outside the public web root. - Open the
wp-config.phpfile in the root directory of the WordPress installation. It is normally alongside directories such aswp-admin,wp-contentandwp-includes. - Find the comment that says
/* That's all, stop editing! Happy publishing. */or the equivalent stop-editing marker.
Add the constant once
Insert this line before the stop-editing comment:
define( 'DISABLE_WP_CRON', true );Save the file and check that the constant appears only once. Defining it twice can produce a PHP notice and makes later troubleshooting harder. Keep the spacing and punctuation shown above; the value must be the Boolean true, not a quoted string.
The official Plugin Handbook instructions for hooking WP-Cron into a system task scheduler document this constant and the platform-specific replacement approach.
Understand what this switch does
DISABLE_WP_CRON stops WordPress from attempting its normal visitor-triggered spawn. It does not execute due events, reschedule missed events or create a server job for you. The replacement trigger must already be configured—or be configured immediately afterward—before you rely on the setting. If you need an emergency rollback, remove the line or change the value to false, restore the file, and investigate the scheduler before disabling the visitor trigger again.
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Choose how the replacement trigger will call WordPress
A scheduler can invoke the cron runner in three practical ways. Use the method your host supports and use the paths, PHP binary and site URL supplied by that host.
| Trigger method | What the scheduler runs | When it fits | Important consideration |
|---|---|---|---|
| HTTP request | Requests https://example.com/wp-cron.php?doing_wp_cron |
The host permits outbound HTTP but restricts direct PHP CLI execution | Use the site’s canonical HTTPS URL and review web-server or application authentication rules |
| Direct PHP | Runs wp-cron.php with the server’s PHP binary |
You have shell or control-panel command access and know the WordPress path | The command-line PHP version and extensions must be compatible with the web site |
| WP-CLI | Uses WP-CLI cron commands to test, inspect or run events | WP-CLI is installed and supported by the host | The scheduler still needs to invoke an appropriate WordPress cron runner |
HTTP is often the least dependent on filesystem paths. Direct PHP avoids an extra network request and can be easier to isolate in server logs. WP-CLI provides the most useful inspection commands, but its availability and PHP environment vary by host.
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Set up Linux or macOS cron
Prepare the command
First determine the absolute path to the site’s wp-cron.php and the PHP executable supplied by your host. A direct-PHP entry might look like this:
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If direct PHP is unavailable, use an HTTP request:
*/5 * * * * /usr/bin/curl -fsS https://example.com/wp-cron.php?doing_wp_cron >/dev/nullThe -f option makes curl fail on an HTTP error, -sS keeps normal output quiet while retaining errors, and the query parameter tells WordPress this is a cron request. Use the exact public URL for the installation, including any required subdirectory. If your URL contains shell-sensitive characters, quote it according to your shell’s rules.
Install and inspect the crontab
- Log in as the operating-system user that owns the WordPress files, or use the account your host specifies for the site.
- Run
crontab -eto open that user’s crontab. - Add one complete scheduler line, save the file and exit the editor.
- Run
crontab -land confirm that the line is present exactly once.
Running as the file-owning user helps prevent cron-created files from being owned by an unexpected account. It also keeps permissions consistent with web requests. A host may require a panel-managed cron instead of a user crontab; follow the host’s documented PHP path and working directory in that case.
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Start from the shortest delay a business or plugin requirement can tolerate. If no event needs near-real-time execution, a less frequent interval reduces process starts. Avoid adding several overlapping entries for the same site: overlapping runs can compete for locks and database resources. When a single run can last longer than the interval, increase the interval or investigate the slow hook rather than launching more concurrent processes.
Set up Windows Task Scheduler
Windows does not use a Unix crontab. Create a scheduled task that launches either PHP or an HTTP client.
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- Open Task Scheduler and choose Create Task (or Create Basic Task for a simpler wizard).
- On Triggers, create a schedule that repeats at the cadence your site requires. Enable the task and choose the correct time zone for the server.
- On Actions, select Start a program. For direct execution, set Program/script to the full path of
php.exeand add the full path towp-cron.phpin Add arguments. For HTTP execution, use the full path to a supported command-line HTTP client and pass the cron URL as its argument. - On General, choose an account with permission to read the WordPress files and run PHP. If the task must run while no one is logged in, select the corresponding unattended-run option and provide credentials as required by your Windows policy.
- Save the task, right-click it and select Run once manually. Check Last Run Result and the task history before waiting for the next interval.
Use the PHP version and extensions that match the web site’s supported runtime. A task that launches a different PHP installation can fail even though browser requests work.
Use a hosting control-panel scheduler
Many hosting panels expose a “Cron Jobs,” “Scheduled Tasks” or similar screen. Add either the direct-PHP command or the HTTP command shown above, then select the interval. Panels often require a full executable path and may provide a separate field for the minute, hour, day, month and weekday values. Preserve the complete command and avoid adding a second scheduler entry in another panel or account.
If the panel offers a “run PHP script” action, select the site’s supported PHP version and provide the absolute path to wp-cron.php. If it offers only a URL fetch, use the canonical HTTPS cron URL. Ask the host which account runs scheduled jobs and where its output and failure logs are stored; those details are essential when a task reports success but events do not advance.
Verify the runner before depending on it
Test the spawning system
With WP-CLI installed, run this from the WordPress directory:
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wp cron testThe official WP-CLI cron reference defines this command as a test of the WP-Cron spawning system. A successful result shows that WordPress can attempt to start its cron process; it does not prove that every plugin hook completes successfully.
Inspect schedules and events
Use WP-CLI’s cron subcommands to examine what is registered:
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wp cron event run --due-nowwp cron schedule shows registered recurrence schedules. wp cron event list displays queued events, their next run times and hook names. wp cron event run --due-now runs events that are currently due, which is useful after confirming the scheduler command itself works. Run this manually only when you understand the workload; it can trigger every due hook at once.
Confirm real application results
- Create or identify a harmless scheduled action, then verify that its next-run time changes after the task fires.
- Check a scheduled post, plugin queue, cleanup task or other expected hook in its own administration screen.
- Review the scheduler’s last-run time, exit status and output log.
- Review PHP and web-server logs for fatal errors, timeouts, denied requests, authentication failures and incorrect paths.
Do not remove the replacement trigger’s logging until you have observed successful runs at the intended cadence. A command can exit cleanly while a plugin callback fails inside WordPress.
Troubleshoot late or missing events
The scheduler never runs
- Check that the task is enabled and that its time zone matches the server’s time zone.
- For Unix systems, confirm the line with
crontab -land inspect the scheduler service log. - For Windows, check Task Scheduler history, Last Run Result and the account selected on the General tab.
- For a hosting panel, confirm that the job was saved under the correct site or account and that the host permits scheduled tasks.
The command runs but WordPress does not process events
- Verify the absolute WordPress path and PHP executable. A typo or a PHP binary without required extensions can stop execution before WordPress loads.
- Run the exact command manually as the scheduler’s operating-system user and capture its output instead of discarding it.
- Confirm that
wp-config.phpis readable and that the scheduler user can read the WordPress files. - For HTTP, test the full HTTPS URL with verbose curl output and check for redirects, TLS errors, web-application firewalls or HTTP authentication.
- Run
wp cron test, then inspectwp cron event listfor a queue that is not advancing.
Events are still late
Compare the event’s due time with the scheduler’s actual start times. A five-minute trigger cannot guarantee completion in five minutes if a PHP process routinely takes longer, the server is overloaded or a callback waits on an external service. Look for long-running hooks, database locks and PHP timeouts. Increase resources or interval, optimize the slow callback, or split heavy work into smaller jobs rather than adding overlapping cron entries.
Everything stopped after disabling WP-Cron
Re-enable visitor-triggered WP-Cron temporarily by removing the constant or setting it to false. Then repair the scheduler, test it manually and observe event execution before disabling the constant again. This rollback restores WordPress’s fallback trigger; it does not fix a broken plugin callback or an inaccessible server.
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WP-Cron versus a real scheduler
| Decision factor | Visitor-triggered WP-Cron | System or hosting scheduler |
|---|---|---|
| Timing | Depends on incoming WordPress requests, so low-traffic sites can execute due events late | Starts according to the scheduler’s configured timetable |
| Access required | No shell or scheduler access is needed | Requires shell access, a control-panel feature or host support |
| Resource control | Checks can occur during page loads and use the web request environment | Can be assigned a cadence and operating-system account |
| Failure visibility | Requires WordPress-level inspection and application logs | Provides job history, logs and an exit status, with WP-CLI available for event inspection |
| Operational risk | Works as the built-in fallback but may be late on low-traffic sites | More predictable when correctly configured; disabling WP-Cron without it leaves hooks untriggered |
The choice is operational rather than ideological. A small site with non-urgent tasks may be perfectly served by the default behavior. A site that promises a publication time or runs regular queues benefits from a scheduler it can monitor and tune.
Quick Recap
Final preflight checklist
- Back up
wp-config.php. - Add
DISABLE_WP_CRONonce, before the stop-editing comment. - Record the correct WordPress path, PHP binary, PHP version and scheduler account.
- Choose one trigger method and one scheduler entry.
- Set a cadence based on the site’s most time-sensitive task and available resources.
- Run the command manually, then run the scheduler task manually.
- Run
wp cron testand inspect schedules and due events. - Check scheduler, PHP and web-server logs.
- Confirm scheduled posts, plugin queues and maintenance hooks advance.
- Keep a rollback copy of
wp-config.phpand a documented way to re-enable the fallback.
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