diff --git a/manifests/base/crds/full/argoproj.io_cronworkflows.yaml b/manifests/base/crds/full/argoproj.io_cronworkflows.yaml
index a6edc5e83250..1838c56d7bbc 100644
--- a/manifests/base/crds/full/argoproj.io_cronworkflows.yaml
+++ b/manifests/base/crds/full/argoproj.io_cronworkflows.yaml
@@ -57,7 +57,7 @@ spec:
                 description: 'v3.6 and after: Schedules is a list of schedules to
                   run the Workflow in Cron format'
                 items:
-                  pattern: ^(@(yearly|annually|monthly|weekly|daily|midnight|hourly)|@every\s+([0-9]+(ns|us|µs|ms|s|m|h))+|([0-9*,/?-]+\s+){4}[0-9*,/?-]+)$
+                  pattern: ^(@(yearly|annually|monthly|weekly|daily|midnight|hourly)|@every\s+([0-9]+(ns|us|µs|ms|s|m|h))+|([A-Za-z0-9*,/?-]+\s+){4}[A-Za-z0-9*,/?-]+)$
                   type: string
                 minItems: 1
                 type: array
diff --git a/manifests/quick-start-minimal.yaml b/manifests/quick-start-minimal.yaml
index 13099668519c..19bd46c0d4a6 100644
--- a/manifests/quick-start-minimal.yaml
+++ b/manifests/quick-start-minimal.yaml
@@ -40732,7 +40732,7 @@ spec:
                 description: 'v3.6 and after: Schedules is a list of schedules to
                   run the Workflow in Cron format'
                 items:
-                  pattern: ^(@(yearly|annually|monthly|weekly|daily|midnight|hourly)|@every\s+([0-9]+(ns|us|µs|ms|s|m|h))+|([0-9*,/?-]+\s+){4}[0-9*,/?-]+)$
+                  pattern: ^(@(yearly|annually|monthly|weekly|daily|midnight|hourly)|@every\s+([0-9]+(ns|us|µs|ms|s|m|h))+|([A-Za-z0-9*,/?-]+\s+){4}[A-Za-z0-9*,/?-]+)$
                   type: string
                 minItems: 1
                 type: array
diff --git a/manifests/quick-start-mysql.yaml b/manifests/quick-start-mysql.yaml
index 443efae033a2..b81cd3cca547 100644
--- a/manifests/quick-start-mysql.yaml
+++ b/manifests/quick-start-mysql.yaml
@@ -40732,7 +40732,7 @@ spec:
                 description: 'v3.6 and after: Schedules is a list of schedules to
                   run the Workflow in Cron format'
                 items:
-                  pattern: ^(@(yearly|annually|monthly|weekly|daily|midnight|hourly)|@every\s+([0-9]+(ns|us|µs|ms|s|m|h))+|([0-9*,/?-]+\s+){4}[0-9*,/?-]+)$
+                  pattern: ^(@(yearly|annually|monthly|weekly|daily|midnight|hourly)|@every\s+([0-9]+(ns|us|µs|ms|s|m|h))+|([A-Za-z0-9*,/?-]+\s+){4}[A-Za-z0-9*,/?-]+)$
                   type: string
                 minItems: 1
                 type: array
diff --git a/manifests/quick-start-postgres.yaml b/manifests/quick-start-postgres.yaml
index b67bea19cc06..ef5d8eb58dc6 100644
--- a/manifests/quick-start-postgres.yaml
+++ b/manifests/quick-start-postgres.yaml
@@ -40732,7 +40732,7 @@ spec:
                 description: 'v3.6 and after: Schedules is a list of schedules to
                   run the Workflow in Cron format'
                 items:
-                  pattern: ^(@(yearly|annually|monthly|weekly|daily|midnight|hourly)|@every\s+([0-9]+(ns|us|µs|ms|s|m|h))+|([0-9*,/?-]+\s+){4}[0-9*,/?-]+)$
+                  pattern: ^(@(yearly|annually|monthly|weekly|daily|midnight|hourly)|@every\s+([0-9]+(ns|us|µs|ms|s|m|h))+|([A-Za-z0-9*,/?-]+\s+){4}[A-Za-z0-9*,/?-]+)$
                   type: string
                 minItems: 1
                 type: array
diff --git a/manifests/quick-start-telemetry.yaml b/manifests/quick-start-telemetry.yaml
index 49ac2eae054c..37cd20bb5bfa 100644
--- a/manifests/quick-start-telemetry.yaml
+++ b/manifests/quick-start-telemetry.yaml
@@ -40732,7 +40732,7 @@ spec:
                 description: 'v3.6 and after: Schedules is a list of schedules to
                   run the Workflow in Cron format'
                 items:
-                  pattern: ^(@(yearly|annually|monthly|weekly|daily|midnight|hourly)|@every\s+([0-9]+(ns|us|µs|ms|s|m|h))+|([0-9*,/?-]+\s+){4}[0-9*,/?-]+)$
+                  pattern: ^(@(yearly|annually|monthly|weekly|daily|midnight|hourly)|@every\s+([0-9]+(ns|us|µs|ms|s|m|h))+|([A-Za-z0-9*,/?-]+\s+){4}[A-Za-z0-9*,/?-]+)$
                   type: string
                 minItems: 1
                 type: array
diff --git a/pkg/apis/workflow/v1alpha1/cron_workflow_types.go b/pkg/apis/workflow/v1alpha1/cron_workflow_types.go
index 9793c84a23e9..141fe92548b6 100644
--- a/pkg/apis/workflow/v1alpha1/cron_workflow_types.go
+++ b/pkg/apis/workflow/v1alpha1/cron_workflow_types.go
@@ -66,7 +66,7 @@ type CronWorkflowSpec struct {
 	StopStrategy *StopStrategy `json:"stopStrategy,omitempty" protobuf:"bytes,10,opt,name=stopStrategy"`
 	// v3.6 and after: Schedules is a list of schedules to run the Workflow in Cron format
 	// +kubebuilder:validation:MinItems=1
-	// +kubebuilder:validation:items:Pattern=`^(@(yearly|annually|monthly|weekly|daily|midnight|hourly)|@every\s+([0-9]+(ns|us|µs|ms|s|m|h))+|([0-9*,/?-]+\s+){4}[0-9*,/?-]+)$`
+	// +kubebuilder:validation:items:Pattern=`^(@(yearly|annually|monthly|weekly|daily|midnight|hourly)|@every\s+([0-9]+(ns|us|µs|ms|s|m|h))+|([A-Za-z0-9*,/?-]+\s+){4}[A-Za-z0-9*,/?-]+)$`
 	Schedules []string `json:"schedules" protobuf:"bytes,11,opt,name=schedules"`
 	// v3.6 and after: When is an expression that determines if a run should be scheduled.
 	When string `json:"when,omitempty" protobuf:"bytes,12,opt,name=when"`
diff --git a/pkg/apis/workflow/v1alpha1/generated.proto b/pkg/apis/workflow/v1alpha1/generated.proto
index 5afe990b7315..eb5480dd1d59 100644
--- a/pkg/apis/workflow/v1alpha1/generated.proto
+++ b/pkg/apis/workflow/v1alpha1/generated.proto
@@ -524,7 +524,7 @@ message CronWorkflowSpec {
 
   // v3.6 and after: Schedules is a list of schedules to run the Workflow in Cron format
   // +kubebuilder:validation:MinItems=1
-  // +kubebuilder:validation:items:Pattern=`^(@(yearly|annually|monthly|weekly|daily|midnight|hourly)|@every\s+([0-9]+(ns|us|µs|ms|s|m|h))+|([0-9*,/?-]+\s+){4}[0-9*,/?-]+)$`
+  // +kubebuilder:validation:items:Pattern=`^(@(yearly|annually|monthly|weekly|daily|midnight|hourly)|@every\s+([0-9]+(ns|us|µs|ms|s|m|h))+|([A-Za-z0-9*,/?-]+\s+){4}[A-Za-z0-9*,/?-]+)$`
   repeated string schedules = 11;
 
   // v3.6 and after: When is an expression that determines if a run should be scheduled.