diff --git a/.changelog/10233.txt b/.changelog/10233.txt
new file mode 100644
index 00000000000..42b910df155
--- /dev/null
+++ b/.changelog/10233.txt
@@ -0,0 +1,3 @@
+```release-note:none
+
+```
\ No newline at end of file
diff --git a/.teamcity/components/projects/reused/nightly_tests.kt b/.teamcity/components/projects/reused/nightly_tests.kt
index cb6455e5f75..75fd33a9d52 100644
--- a/.teamcity/components/projects/reused/nightly_tests.kt
+++ b/.teamcity/components/projects/reused/nightly_tests.kt
@@ -51,7 +51,7 @@ fun nightlyTests(parentProject:String, providerName: String, vcsRoot: GitVcsRoot
         else -> throw Exception("Provider name not supplied when generating a nightly test subproject")
     }
     val serviceSweeperConfig = BuildConfigurationForServiceSweeper(providerName, ServiceSweeperName, sweepersList, projectId, vcsRoot, sharedResources, config)
-    val sweeperTrigger  = NightlyTriggerConfiguration(startHour=12)  // Override hour
+    val sweeperTrigger  = NightlyTriggerConfiguration(startHour=11)  // Override hour
     serviceSweeperConfig.addTrigger(sweeperTrigger)
 
     return Project {
diff --git a/.teamcity/tests/sweepers.kt b/.teamcity/tests/sweepers.kt
index 67940004bc6..34f9dfd2c5a 100644
--- a/.teamcity/tests/sweepers.kt
+++ b/.teamcity/tests/sweepers.kt
@@ -7,12 +7,14 @@
 
 package tests
 
+import ProjectSweeperName
 import ServiceSweeperName
 import jetbrains.buildServer.configs.kotlin.BuildType
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertTrue
 import org.junit.Test
 import jetbrains.buildServer.configs.kotlin.Project
+import jetbrains.buildServer.configs.kotlin.triggers.ScheduleTrigger
 import org.junit.Assert
 import projects.googleCloudRootProject
 
@@ -102,4 +104,40 @@ class SweeperTests {
         val value = sweeper!!.params.findRawParam("PACKAGE_PATH")!!.value
         assertEquals("./google-beta/sweeper", value)
     }
+
+    @Test
+    fun projectSweepersRunAfterServiceSweepers() {
+        val project = googleCloudRootProject(testContextParameters())
+
+        // Find GA nightly test project's service sweeper
+        val gaNightlyTests: Project = getSubProject(project, gaProjectName, nightlyTestsProjectName)
+        val sweeperGa: BuildType = getBuildFromProject(gaNightlyTests, ServiceSweeperName)
+
+        // Find Beta nightly test project's service sweeper
+        val betaNightlyTests : Project = getSubProject(project, betaProjectName, nightlyTestsProjectName)
+        val sweeperBeta: BuildType = getBuildFromProject(betaNightlyTests, ServiceSweeperName)
+
+        // Find Project sweeper project's build
+        val projectSweeperProject : Project? =  project.subProjects.find { p->  p.name == projectSweeperProjectName}
+        if (projectSweeperProject == null) {
+            Assert.fail("Could not find the Project Sweeper project")
+        }
+        val projectSweeper: BuildType = getBuildFromProject(projectSweeperProject!!, ProjectSweeperName)
+        
+        // Check only one schedule trigger is on the builds in question
+        assertTrue(sweeperGa.triggers.items.size == 1)
+        assertTrue(sweeperBeta.triggers.items.size == 1)
+        assertTrue(projectSweeper.triggers.items.size == 1)
+
+        // Assert that the hour value that sweeper builds are triggered at is less than the hour value that project sweeper builds are triggered at
+        // i.e. sweeper builds are triggered first
+        val stGa = sweeperGa.triggers.items[0] as ScheduleTrigger
+        val cronGa = stGa.schedulingPolicy as ScheduleTrigger.SchedulingPolicy.Cron
+        val stBeta = sweeperBeta.triggers.items[0] as ScheduleTrigger
+        val cronBeta = stBeta.schedulingPolicy as ScheduleTrigger.SchedulingPolicy.Cron
+        val stProject = projectSweeper.triggers.items[0] as ScheduleTrigger
+        val cronProject = stProject.schedulingPolicy as ScheduleTrigger.SchedulingPolicy.Cron
+        assertTrue("Service sweeper for the GA Nightly Test project is triggered at an earlier hour than the project sweeper", cronGa.hours.toString() < cronProject.hours.toString()) // Values are strings like "11", "12"
+        assertTrue("Service sweeper for the Beta Nightly Test project is triggered at an earlier hour than the project sweeper", cronBeta.hours.toString() < cronProject.hours.toString() )
+    }
 }
diff --git a/.teamcity/tests/test_utils.kt b/.teamcity/tests/test_utils.kt
index 3389af8bff8..29d3d53ca2e 100644
--- a/.teamcity/tests/test_utils.kt
+++ b/.teamcity/tests/test_utils.kt
@@ -8,6 +8,8 @@
 package tests
 
 import builds.AllContextParameters
+import jetbrains.buildServer.BuildProject
+import jetbrains.buildServer.configs.kotlin.BuildType
 import jetbrains.buildServer.configs.kotlin.Project
 import org.junit.Assert
 
@@ -56,15 +58,24 @@ fun testContextParameters(): AllContextParameters {
 
 fun getSubProject(rootProject: Project, parentProjectName: String, subProjectName: String): Project {
     // Find parent project within root
-    var parentProject: Project? =  rootProject.subProjects.find { p->  p.name == parentProjectName}
+    val parentProject: Project? =  rootProject.subProjects.find { p->  p.name == parentProjectName}
     if (parentProject == null) {
         Assert.fail("Could not find the $parentProjectName project")
     }
     // Find subproject within parent identified above
-    var subProject: Project?  = parentProject!!.subProjects.find { p->  p.name == subProjectName}
+    val subProject: Project?  = parentProject!!.subProjects.find { p->  p.name == subProjectName}
     if (subProject == null) {
         Assert.fail("Could not find the $subProjectName project")
     }
 
     return subProject!!
+}
+
+fun getBuildFromProject(parentProject: Project, buildName: String): BuildType {
+    val buildType: BuildType?  = parentProject!!.buildTypes.find { p->  p.name == buildName}
+    if (buildType == null) {
+        Assert.fail("Could not find the '$buildName' build in project ${parentProject.name}")
+    }
+
+    return buildType!!
 }
\ No newline at end of file