How to make a Minecraft countdown with bossbar and command blocks
A bossbar can show a timer, but the bar does not count down by itself. The setup command creates the bar, and something else must update its value every second or every tick. That update layer can be a repeating command block chain or a datapack function.
Create the bossbar first
Start by adding a named bossbar, setting its color, style, maximum value, current value, and players. The builder handles this setup cleanly. For a 60 second timer, set max to 60 and value to 60.
Use a scoreboard for the timer state
A scoreboard objective gives Minecraft a number to count down. Store the remaining seconds there, then use commands to copy that number into the bossbar value. This keeps the visible bar tied to real server state.
Update the value repeatedly
A repeating command block or scheduled datapack function should subtract time and then run a bossbar value update. One static /bossbar command cannot do this alone.
Finish cleanly
When the timer reaches zero, hide or remove the bossbar, run the event command, and stop the update loop. Clean endings matter because stale bossbars make later events confusing.
Step
| Step | Example command | Purpose |
|---|---|---|
| Create objective | /scoreboard objectives add event_timer dummy | Stores remaining time. |
| Set time | /scoreboard players set #timer event_timer 60 | Starts at 60 seconds. |
| Show bar | /bossbar set cube:event value 60 | Initial visible value. |
| Tick down | /scoreboard players remove #timer event_timer 1 | Repeating update step. |
| Copy value | /execute store result bossbar cube:event value run scoreboard players get #timer event_timer | Syncs scoreboard to bossbar. |
FAQ
Can one command create a live countdown?
No. The bar can be created by one command, but countdown behavior requires repeated updates.
Should I use ticks or seconds?
Seconds are easier for command blocks. Ticks are better when a datapack already controls the event loop.
What happens at zero?
Run the payoff command, then hide or remove the bar so the next event starts cleanly.