diff --git a/pkg/asset/machines/aws/zones.go b/pkg/asset/machines/aws/zones.go
index 50788f115f6..24b080e5943 100644
--- a/pkg/asset/machines/aws/zones.go
+++ b/pkg/asset/machines/aws/zones.go
@@ -8,8 +8,16 @@ import (
 	awsutil "github.com/openshift/installer/pkg/asset/installconfig/aws"
 )
 
+var cache map[string][]string
+
 // AvailabilityZones retrieves a list of availability zones for the given region.
 func AvailabilityZones(region string) ([]string, error) {
+	if cache == nil {
+		cache = map[string][]string{}
+	} else if zones, ok := cache[region]; ok {
+		return zones, nil
+	}
+
 	ec2Client, err := ec2Client(region)
 	if err != nil {
 		return nil, err
@@ -18,6 +26,7 @@ func AvailabilityZones(region string) ([]string, error) {
 	if err != nil {
 		return nil, fmt.Errorf("cannot fetch availability zones: %v", err)
 	}
+	cache[region] = zones
 	return zones, nil
 }