diff --git a/taskiq/cli/scheduler/run.py b/taskiq/cli/scheduler/run.py
index 06382c43..744ca0f4 100644
--- a/taskiq/cli/scheduler/run.py
+++ b/taskiq/cli/scheduler/run.py
@@ -4,7 +4,7 @@
 from datetime import datetime, timedelta, timezone
 from logging import basicConfig, getLogger
 from typing import Any, TypeAlias
-from zoneinfo import ZoneInfo
+from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 
 import pycron
 
@@ -99,7 +99,13 @@ def is_cron_task_now(
     # If timezone was specified as string we convert it timezone
     # offset and then apply.
     elif offset and isinstance(offset, str):
-        now = now.astimezone(ZoneInfo(offset))
+        try:
+            now = now.astimezone(ZoneInfo(offset))
+        # ZoneInfoNotFoundError for unknown keys, ModuleNotFoundError
+        # for systems without timezone data available (e.g. missing
+        # tzdata on Windows).
+        except (ZoneInfoNotFoundError, ModuleNotFoundError) as e:
+            raise CronValueError(e) from e
 
     try:
         return pycron.is_now(cron_value, now)
diff --git a/tests/cli/scheduler/test_is_cron_task_now.py b/tests/cli/scheduler/test_is_cron_task_now.py
index bbbe079b..36b1365a 100644
--- a/tests/cli/scheduler/test_is_cron_task_now.py
+++ b/tests/cli/scheduler/test_is_cron_task_now.py
@@ -75,3 +75,16 @@ def test_is_cron_task_now(
 def test_is_cron_task_now_invalid_cron() -> None:
     with pytest.raises(CronValueError):
         is_cron_task_now("invalid cron", datetime.now())
+
+
+@pytest.mark.parametrize(
+    "offset",
+    ["UTC+3", "Europa/Madrid"],
+)
+def test_is_cron_task_now_invalid_offset_string(offset: str) -> None:
+    with pytest.raises(CronValueError):
+        is_cron_task_now(
+            cron_value="* * * * *",
+            now=datetime.now(timezone.utc),
+            offset=offset,
+        )