diff --git a/scripts/build/restore-packages.ps1 b/scripts/build/restore-packages.ps1
index 7ec12dced..9bce280c5 100644
--- a/scripts/build/restore-packages.ps1
+++ b/scripts/build/restore-packages.ps1
@@ -5,6 +5,27 @@
 
 . $PSScriptRoot\..\common\_common.ps1
 
+if ($env:CI_BUILD -eq "1") {
+    # periodically clear out the package cache on the CI server
+    $PackageCacheFile = "$env:NUGET_PACKAGES\packageCacheTime.txt"
+
+    if(!(Test-Path $PackageCacheFile)) {
+        Get-Date | Out-File -FilePath $PackageCacheFile
+    }
+    else {
+        $PackageCacheTimeProperty = Get-ItemProperty -Path $PackageCacheFile -Name CreationTimeUtc
+        $PackageCacheTime = [datetime]($PackageCacheTimeProperty).CreationTimeUtc
+
+        if ($PackageCacheTime -lt ([datetime]::UtcNow).AddHours(-$env:NUGET_PACKAGES_CACHE_TIME_LIMIT)) {
+            header "Clearing package cache"
+
+            Remove-Item -Recurse -Force "$env:NUGET_PACKAGES"
+            mkdir $env:NUGET_PACKAGES | Out-Null
+            Get-Date | Out-File -FilePath $PackageCacheFile
+        }
+    }
+}
+
 # Restore packages
 # NOTE(anurse): I had to remove --quiet, because NuGet3 is too quiet when that's provided :(
 header "Restoring packages"
diff --git a/scripts/build/restore-packages.sh b/scripts/build/restore-packages.sh
index f5235c4aa..44975fbf6 100755
--- a/scripts/build/restore-packages.sh
+++ b/scripts/build/restore-packages.sh
@@ -16,6 +16,26 @@ DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
 
 source "$DIR/../common/_common.sh"
 
+if [ ! -z "$CI_BUILD" ]; then
+	# periodically clear out the package cache on the CI server
+	PackageCacheFile="$NUGET_PACKAGES/packageCacheTime.txt"
+	if [ ! -f $PackageCacheFile ]; then
+		date > $PackageCacheFile
+	else
+		#$NUGET_PACKAGES_CACHE_TIME_LIMIT is in hours
+		CacheTimeLimitInSeconds=$(($NUGET_PACKAGES_CACHE_TIME_LIMIT * 3600))
+		CacheExpireTime=$(($(date +%s) - $CacheTimeLimitInSeconds))
+
+		if [ $(date +%s -r $PackageCacheFile) -lt $CacheExpireTime ]; then
+			header "Clearing package cache"
+
+			rm -Rf $NUGET_PACKAGES
+			mkdir -p $NUGET_PACKAGES
+			date > $PackageCacheFile
+		fi
+	fi
+fi
+
 header "Restoring packages"
 
 dotnet restore "$REPOROOT/src" --runtime "$RID" $DISABLE_PARALLEL
diff --git a/scripts/ci_build.sh b/scripts/ci_build.sh
index c7604c65e..488e3192a 100755
--- a/scripts/ci_build.sh
+++ b/scripts/ci_build.sh
@@ -6,6 +6,8 @@
 
 set -e
 
+export CI_BUILD=1
+
 SOURCE="${BASH_SOURCE[0]}"
 while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
   DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
diff --git a/scripts/common/_nuget.ps1 b/scripts/common/_nuget.ps1
index 8fe724905..df3428d69 100644
--- a/scripts/common/_nuget.ps1
+++ b/scripts/common/_nuget.ps1
@@ -3,14 +3,12 @@
 # Licensed under the MIT license. See LICENSE file in the project root for full license information.
 #
 
-if ($env:CI_BUILD -eq "1") {
-    $env:NUGET_PACKAGES = (Join-Path $RepoRoot "artifacts\home\.nuget\packages")
-} else {
-    $env:NUGET_PACKAGES = (Join-Path $env:USERPROFILE ".nuget\packages")
-}
-
+$env:NUGET_PACKAGES = (Join-Path $env:USERPROFILE ".nuget\packages")
 $env:DOTNET_PACKAGES = $env:NUGET_PACKAGES
 $env:DNX_PACKAGES = $env:NUGET_PACKAGES
 if(!(Test-Path $env:NUGET_PACKAGES)) {
     mkdir $env:NUGET_PACKAGES | Out-Null
-}
\ No newline at end of file
+}
+
+# default the package cache expiration to 1 week, in hours
+setEnvIfDefault "NUGET_PACKAGES_CACHE_TIME_LIMIT" (7 * 24)
diff --git a/scripts/common/_nuget.sh b/scripts/common/_nuget.sh
index 8261dd446..3c03f7523 100644
--- a/scripts/common/_nuget.sh
+++ b/scripts/common/_nuget.sh
@@ -4,7 +4,15 @@
 # Licensed under the MIT license. See LICENSE file in the project root for full license information.
 #
 
-## Temporarily redirect to the NuGet package installation location
 export NUGET_PACKAGES=~/.nuget/packages
 export DOTNET_PACKAGES=$NUGET_PACKAGES
-export DNX_PACKAGES=$NUGET_PACKAGES
\ No newline at end of file
+export DNX_PACKAGES=$NUGET_PACKAGES
+
+if [ ! -d $NUGET_PACKAGES ]; then
+	mkdir -p $NUGET_PACKAGES
+fi
+
+if [ -z "$NUGET_PACKAGES_CACHE_TIME_LIMIT" ]; then
+	# default the package cache expiration to 1 week, in hours
+	export NUGET_PACKAGES_CACHE_TIME_LIMIT=$(( 7 * 24 ))
+fi