diff --git a/start_node_genesis_gcp.sh b/start_node_genesis_gcp.sh
index 8f03b1dec..cd8dd26ae 100644
--- a/start_node_genesis_gcp.sh
+++ b/start_node_genesis_gcp.sh
@@ -48,7 +48,12 @@ function parse_options() {
 }
 
 # Parse options.
-SEASON="$1"
+if [[ "$1" = 'dev' ]] || [[ "$1" = 'staging' ]] || [[ "$1" = 'sandbox' ]] || [[ "$1" = 'exp' ]] || [[ "$1" = 'spring' ]] || [[ "$1" = 'summer' ]] || [[ "$1" = 'mainnet' ]]; then
+    SEASON="$1"
+else
+    printf "Invalid project/season argument: $1\n"
+    exit
+fi
 GCP_USER="$2"
 
 number_re='^[0-9]+$'
diff --git a/start_node_genesis_onprem.sh b/start_node_genesis_onprem.sh
index c99692d68..8249e5503 100644
--- a/start_node_genesis_onprem.sh
+++ b/start_node_genesis_onprem.sh
@@ -58,7 +58,12 @@ function parse_options() {
 }
 
 # Parse options.
-SEASON="$1"
+if [[ "$1" = 'staging' ]] || [[ "$1" = 'spring' ]] || [[ "$1" = 'mainnet' ]]; then
+    SEASON="$1"
+else
+    printf "Invalid project/season argument: $1\n"
+    exit
+fi
 ONPREM_USER="$2"
 
 number_re='^[0-9]+$'
diff --git a/start_node_incremental_gcp.sh b/start_node_incremental_gcp.sh
index 9cb9767c8..e70433c57 100644
--- a/start_node_incremental_gcp.sh
+++ b/start_node_incremental_gcp.sh
@@ -47,7 +47,12 @@ function parse_options() {
 }
 
 # Parse options.
-SEASON="$1"
+if [[ "$1" = 'dev' ]] || [[ "$1" = 'staging' ]] || [[ "$1" = 'sandbox' ]] || [[ "$1" = 'exp' ]] || [[ "$1" = 'spring' ]] || [[ "$1" = 'summer' ]] || [[ "$1" = 'mainnet' ]]; then
+    SEASON="$1"
+else
+    printf "Invalid project/season argument: $1\n"
+    exit
+fi
 GCP_USER="$2"
 
 number_re='^[0-9]+$'
diff --git a/start_node_incremental_onprem.sh b/start_node_incremental_onprem.sh
index 4d3a6c1b7..e76aacbc6 100644
--- a/start_node_incremental_onprem.sh
+++ b/start_node_incremental_onprem.sh
@@ -57,7 +57,12 @@ function parse_options() {
 }
 
 # Parse options.
-SEASON="$1"
+if [[ "$1" = 'staging' ]] || [[ "$1" = 'spring' ]] || [[ "$1" = 'mainnet' ]]; then
+    SEASON="$1"
+else
+    printf "Invalid project/season argument: $1\n"
+    exit
+fi
 ONPREM_USER="$2"
 
 number_re='^[0-9]+$'