diff --git a/Lib/idlelib/colorizer.py b/Lib/idlelib/colorizer.py
index b4df353012b788..5e7de4e689c084 100644
--- a/Lib/idlelib/colorizer.py
+++ b/Lib/idlelib/colorizer.py
@@ -47,7 +47,7 @@ def make_pat():
                    name not in keyword.kwlist]
     builtin = r"([^.'\"\\#]\b|^)" + any("BUILTIN", builtinlist) + r"\b"
     comment = any("COMMENT", [r"#[^\n]*"])
-    stringprefix = r"(?i:r|u|f|fr|rf|b|br|rb)?"
+    stringprefix = r"(?i:r|u|f|fr|rf|b|br|rb|t|tr|rt)?"
     sqstring = stringprefix + r"'[^'\\\n]*(\\.[^'\\\n]*)*'?"
     dqstring = stringprefix + r'"[^"\\\n]*(\\.[^"\\\n]*)*"?'
     sq3string = stringprefix + r"'''[^'\\]*((\\.|'(?!''))[^'\\]*)*(''')?"
diff --git a/Misc/NEWS.d/next/IDLE/2025-10-08-14-08-03.gh-issue-139742.NT6DuQ.rst b/Misc/NEWS.d/next/IDLE/2025-10-08-14-08-03.gh-issue-139742.NT6DuQ.rst
new file mode 100644
index 00000000000000..609c78c3500d6e
--- /dev/null
+++ b/Misc/NEWS.d/next/IDLE/2025-10-08-14-08-03.gh-issue-139742.NT6DuQ.rst
@@ -0,0 +1 @@
+Make IDLE supported for t-string