diff --git a/lib/phoenix_ecto/check_repo_status.ex b/lib/phoenix_ecto/check_repo_status.ex
index 924d4be..705d558 100644
--- a/lib/phoenix_ecto/check_repo_status.ex
+++ b/lib/phoenix_ecto/check_repo_status.ex
@@ -28,7 +28,7 @@ defmodule Phoenix.Ecto.CheckRepoStatus do
     repos = Application.get_env(opts[:otp_app], :ecto_repos, [])
 
     for repo <- repos, Process.whereis(repo) do
-      unless check_pending_migrations!(repo, opts) do
+      unless check_pending_migrations!(repo, opts, Map.new(repo.config)) do
         check_storage_up!(repo)
       end
     end
@@ -51,7 +51,11 @@ defmodule Phoenix.Ecto.CheckRepoStatus do
     end
   end
 
-  defp check_pending_migrations!(repo, opts) do
+  defp check_pending_migrations!(_repo, _opts, %{read_only: true}) do
+    false
+  end
+
+  defp check_pending_migrations!(repo, opts, _repo_opts) do
     repo_status =
       with {:ok, migration_directories} <- migration_directories(repo, opts),
            {:ok, migrations} <- migrations(repo, migration_directories, opts) do
diff --git a/test/phoenix_ecto/check_repo_status_test.exs b/test/phoenix_ecto/check_repo_status_test.exs
index b926bec..aed8ca9 100644
--- a/test/phoenix_ecto/check_repo_status_test.exs
+++ b/test/phoenix_ecto/check_repo_status_test.exs
@@ -17,6 +17,12 @@ defmodule Phoenix.Ecto.CheckRepoStatusTest do
     def __adapter__, do: Adapter
   end
 
+  defmodule StorageReadOnly do
+    defmodule Adapter, do: def(storage_status(_repo_config), do: :up)
+    def config, do: [read_only: true]
+    def __adapter__, do: Adapter
+  end
+
   defmodule StorageDownRepo do
     defmodule Adapter, do: def(storage_status(_repo_config), do: :down)
     def config, do: []
@@ -96,6 +102,24 @@ defmodule Phoenix.Ecto.CheckRepoStatusTest do
     Process.unregister(StorageUpRepo)
   end
 
+  test "does not raise when there are pending migrations for a read only repo" do
+    Process.register(self(), StorageReadOnly)
+    Application.put_env(:check_repo_ready, :ecto_repos, [StorageReadOnly])
+    mock_migrations_fn = fn _repo, _directories -> [{:down, 1, "migration"}] end
+
+    conn = conn(:get, "/")
+
+    assert CheckRepoStatus.call(
+             conn,
+             otp_app: :check_repo_ready,
+             mock_default_migration_directory_fn: &default_mock_migration_directory_fn/1,
+             mock_migrations_fn: mock_migrations_fn
+           )
+  after
+    Application.delete_env(:check_repo_ready, :ecto_repos)
+    Process.unregister(StorageReadOnly)
+  end
+
   test "supports the `ecto_migration_lock` option" do
     Process.register(self(), StorageUpRepo)
     Application.put_env(:check_repo_ready, :ecto_repos, [StorageUpRepo])