diff --git a/lib/matplotlib/backends/_backend_tk.py b/lib/matplotlib/backends/_backend_tk.py
index b2b8a57191fc..c31c3eda5e18 100644
--- a/lib/matplotlib/backends/_backend_tk.py
+++ b/lib/matplotlib/backends/_backend_tk.py
@@ -96,7 +96,16 @@ def _on_timer(self):
# if _timer is None, this means that _timer_stop has been called; so
# don't recreate the timer in that case.
if not self._single and self._timer:
- self._timer = self.parent.after(self._interval, self._on_timer)
+ if self._interval > 0:
+ self._timer = self.parent.after(self._interval, self._on_timer)
+ else:
+ # Edge case: Tcl after 0 *prepends* events to the queue
+ # so a 0 interval does not allow any other events to run.
+ # This incantation is cancellable and runs as fast as possible
+ # while also allowing events and drawing every frame. GH#18236
+ self._timer = self.parent.after_idle(
+ lambda: self.parent.after(self._interval, self._on_timer)
+ )
else:
self._timer = None
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