diff --git a/devenv/checks/colimaDiskSpace.py b/devenv/checks/colimaDiskSpace.py
new file mode 100644
index 00000000..de5a1a86
--- /dev/null
+++ b/devenv/checks/colimaDiskSpace.py
@@ -0,0 +1,61 @@
+from __future__ import annotations
+
+from devenv.lib import colima
+from devenv.lib import proc
+from devenv.lib_check.types import checker
+from devenv.lib_check.types import fixer
+
+tags: set[str] = {"builtin"}
+name = "colima VM has sufficient disk space"
+
+
+@checker
+def check() -> tuple[bool, str]:
+    status = colima.check()
+    if status != colima.ColimaStatus.UP:
+        return True, ""
+
+    try:
+        output = proc.run(
+            ("colima", "exec", "--", "df", "--output=pcent", "/"), stdout=True
+        )
+    except RuntimeError:
+        return True, ""
+
+    lines = output.strip().split("\n")
+    if len(lines) >= 2:
+        percent_str = lines[1].strip().rstrip("%")
+        try:
+            used_percent = int(percent_str)
+            if used_percent > 90:
+                return (
+                    False,
+                    f"Colima VM disk is {used_percent}% full (less than 10% free space).\n"
+                    "Consider resizing the disk or cleaning up unused Docker images/containers.",
+                )
+        except ValueError:
+            pass
+
+    return True, ""
+
+
+@fixer
+def fix() -> tuple[bool, str]:
+    return (
+        False,
+        """
+First you should try to cleanup unused Docker resources:
+   docker system prune -a
+
+Failing that, you can resize the Colima VM's disk:
+
+1. Stop colima:
+   colima stop
+
+2. Install qemu:
+   brew install qemu
+
+2. Restart colima, resizing to a larger disk (e.g., 200GB):
+   colima start --disk 200
+""",
+    )
diff --git a/devenv/lib/colima.py b/devenv/lib/colima.py
index f9c9e680..35a8f90c 100644
--- a/devenv/lib/colima.py
+++ b/devenv/lib/colima.py
@@ -186,6 +186,10 @@ def start(restart: bool = False) -> ColimaStatus:
             "colima",
             "start",
             "--verbose",
+            # default 60GiB disk is generally not enough over time
+            # since devs work with a lot of images
+            "--disk",
+            "128",
             # this effectively makes the vm's resolvectl status use:
             # DNS Servers: 8.8.8.8 1.1.1.1 192.168.5.2
             # https://lima-vm.io/docs/config/network/user/
diff --git a/tests/checks/test_colimaDiskSpace.py b/tests/checks/test_colimaDiskSpace.py
new file mode 100644
index 00000000..645a0f6a
--- /dev/null
+++ b/tests/checks/test_colimaDiskSpace.py
@@ -0,0 +1,78 @@
+from __future__ import annotations
+
+from unittest import mock
+
+from devenv.checks import colimaDiskSpace
+from devenv.lib import colima
+
+
+def test_check_skipped_when_colima_down() -> None:
+    with mock.patch.object(
+        colima, "check", return_value=colima.ColimaStatus.DOWN
+    ):
+        assert colimaDiskSpace.check() == (True, "")
+
+
+def test_check_skipped_when_colima_unhealthy() -> None:
+    with mock.patch.object(
+        colima, "check", return_value=colima.ColimaStatus.UNHEALTHY
+    ):
+        assert colimaDiskSpace.check() == (True, "")
+
+
+def test_check_passes_when_disk_has_space() -> None:
+    with mock.patch.object(
+        colima, "check", return_value=colima.ColimaStatus.UP
+    ), mock.patch(
+        "devenv.checks.colimaDiskSpace.proc.run", return_value="Use%\n 50%"
+    ):
+        assert colimaDiskSpace.check() == (True, "")
+
+
+def test_check_passes_at_90_percent() -> None:
+    with mock.patch.object(
+        colima, "check", return_value=colima.ColimaStatus.UP
+    ), mock.patch(
+        "devenv.checks.colimaDiskSpace.proc.run", return_value="Use%\n 90%"
+    ):
+        assert colimaDiskSpace.check() == (True, "")
+
+
+def test_check_fails_when_disk_full() -> None:
+    with mock.patch.object(
+        colima, "check", return_value=colima.ColimaStatus.UP
+    ), mock.patch(
+        "devenv.checks.colimaDiskSpace.proc.run", return_value="Use%\n 95%"
+    ):
+        ok, msg = colimaDiskSpace.check()
+        assert ok is False
+        assert "95% full" in msg
+        assert "less than 10% free" in msg
+
+
+def test_check_fails_at_91_percent() -> None:
+    with mock.patch.object(
+        colima, "check", return_value=colima.ColimaStatus.UP
+    ), mock.patch(
+        "devenv.checks.colimaDiskSpace.proc.run", return_value="Use%\n 91%"
+    ):
+        ok, msg = colimaDiskSpace.check()
+        assert ok is False
+
+
+def test_check_skipped_on_df_error() -> None:
+    with mock.patch.object(
+        colima, "check", return_value=colima.ColimaStatus.UP
+    ), mock.patch(
+        "devenv.checks.colimaDiskSpace.proc.run",
+        side_effect=RuntimeError("command failed"),
+    ):
+        assert colimaDiskSpace.check() == (True, "")
+
+
+def test_fix_returns_instructions() -> None:
+    ok, msg = colimaDiskSpace.fix()
+    assert ok is False
+    assert "colima stop" in msg
+    assert "colima start --disk 200" in msg
+    assert "docker system prune" in msg