diff --git a/invokeai/frontend/web/public/locales/en.json b/invokeai/frontend/web/public/locales/en.json
index c8c5699931..28b658a785 100644
--- a/invokeai/frontend/web/public/locales/en.json
+++ b/invokeai/frontend/web/public/locales/en.json
@@ -1015,8 +1015,11 @@
             "addingImagesTo": "Adding images to",
             "invoke": "Invoke",
             "missingFieldTemplate": "Missing field template",
-            "missingInputForField": "{{nodeLabel}} -> {{fieldLabel}} missing input",
+            "missingInputForField": "{{nodeLabel}} -> {{fieldLabel}}: missing input",
             "missingNodeTemplate": "Missing node template",
+            "collectionEmpty": "{{nodeLabel}} -> {{fieldLabel}} empty collection",
+            "collectionTooFewItems": "{{nodeLabel}} -> {{fieldLabel}}: too few items, minimum {{minItems}}",
+            "collectionTooManyItems": "{{nodeLabel}} -> {{fieldLabel}}: too many items, maximum {{maxItems}}",
             "noModelSelected": "No model selected",
             "noT5EncoderModelSelected": "No T5 Encoder model selected for FLUX generation",
             "noFLUXVAEModelSelected": "No VAE model selected for FLUX generation",
diff --git a/invokeai/frontend/web/src/common/hooks/useIsReadyToEnqueue.ts b/invokeai/frontend/web/src/common/hooks/useIsReadyToEnqueue.ts
index a6b8cc671d..8d51b455a1 100644
--- a/invokeai/frontend/web/src/common/hooks/useIsReadyToEnqueue.ts
+++ b/invokeai/frontend/web/src/common/hooks/useIsReadyToEnqueue.ts
@@ -11,6 +11,7 @@ import { $templates } from 'features/nodes/store/nodesSlice';
 import { selectNodesSlice } from 'features/nodes/store/selectors';
 import type { Templates } from 'features/nodes/store/types';
 import { selectWorkflowSettingsSlice } from 'features/nodes/store/workflowSettingsSlice';
+import { isImageFieldCollectionInputInstance, isImageFieldCollectionInputTemplate } from 'features/nodes/types/field';
 import { isInvocationNode } from 'features/nodes/types/invocation';
 import { selectUpscaleSlice } from 'features/parameters/store/upscaleSlice';
 import { selectConfigSlice } from 'features/system/store/configSlice';
@@ -103,14 +104,45 @@ const createSelector = (arg: {
                 return;
               }
 
+              const baseTKeyOptions = {
+                nodeLabel: node.data.label || nodeTemplate.title,
+                fieldLabel: field.label || fieldTemplate.title,
+              };
+
               if (fieldTemplate.required && field.value === undefined && !hasConnection) {
-                reasons.push({
-                  content: i18n.t('parameters.invoke.missingInputForField', {
-                    nodeLabel: node.data.label || nodeTemplate.title,
-                    fieldLabel: field.label || fieldTemplate.title,
-                  }),
-                });
+                reasons.push({ content: i18n.t('parameters.invoke.missingInputForField', baseTKeyOptions) });
                 return;
+              } else if (
+                field.value &&
+                isImageFieldCollectionInputInstance(field) &&
+                isImageFieldCollectionInputTemplate(fieldTemplate)
+              ) {
+                // Image collections may have min or max items to validate
+                // TODO(psyche): generalize this to other collection types
+                if (fieldTemplate.minItems !== undefined && fieldTemplate.minItems > 0 && field.value.length === 0) {
+                  reasons.push({ content: i18n.t('parameters.invoke.collectionEmpty', baseTKeyOptions) });
+                  return;
+                }
+                if (fieldTemplate.minItems !== undefined && field.value.length < fieldTemplate.minItems) {
+                  reasons.push({
+                    content: i18n.t('parameters.invoke.collectionTooFewItems', {
+                      ...baseTKeyOptions,
+                      size: field.value.length,
+                      minItems: fieldTemplate.minItems,
+                    }),
+                  });
+                  return;
+                }
+                if (fieldTemplate.maxItems !== undefined && field.value.length > fieldTemplate.maxItems) {
+                  reasons.push({
+                    content: i18n.t('parameters.invoke.collectionTooManyItems', {
+                      ...baseTKeyOptions,
+                      size: field.value.length,
+                      maxItems: fieldTemplate.maxItems,
+                    }),
+                  });
+                  return;
+                }
               }
             });
           });
diff --git a/invokeai/frontend/web/src/features/nodes/types/field.ts b/invokeai/frontend/web/src/features/nodes/types/field.ts
index 37da8ea504..721370aa4f 100644
--- a/invokeai/frontend/web/src/features/nodes/types/field.ts
+++ b/invokeai/frontend/web/src/features/nodes/types/field.ts
@@ -399,13 +399,13 @@ const zImageFieldCollectionInputTemplate = zFieldInputTemplateBase
     type: zImageCollectionFieldType,
     originalType: zFieldType.optional(),
     default: zImageFieldCollectionValue,
-    maxLength: z.number().int().gte(0).optional(),
-    minLength: z.number().int().gte(0).optional(),
+    maxItems: z.number().int().gte(0).optional(),
+    minItems: z.number().int().gte(0).optional(),
   })
   .refine(
     (val) => {
-      if (val.maxLength !== undefined && val.minLength !== undefined) {
-        return val.maxLength >= val.minLength;
+      if (val.maxItems !== undefined && val.minItems !== undefined) {
+        return val.maxItems >= val.minItems;
       }
       return true;
     },
diff --git a/invokeai/frontend/web/src/features/nodes/util/schema/buildFieldInputTemplate.ts b/invokeai/frontend/web/src/features/nodes/util/schema/buildFieldInputTemplate.ts
index 0cd0027441..69f91cf99c 100644
--- a/invokeai/frontend/web/src/features/nodes/util/schema/buildFieldInputTemplate.ts
+++ b/invokeai/frontend/web/src/features/nodes/util/schema/buildFieldInputTemplate.ts
@@ -417,15 +417,15 @@ const buildImageFieldCollectionInputTemplate: FieldInputTemplateBuilder<ImageFie
   const template: ImageFieldCollectionInputTemplate = {
     ...baseField,
     type: fieldType,
-    default: schemaObject.default ?? undefined,
+    default: schemaObject.default ?? (schemaObject.orig_required ? [] : undefined),
   };
 
-  if (schemaObject.minLength !== undefined) {
-    template.minLength = schemaObject.minLength;
+  if (schemaObject.minItems !== undefined) {
+    template.minItems = schemaObject.minItems;
   }
 
-  if (schemaObject.maxLength !== undefined) {
-    template.maxLength = schemaObject.maxLength;
+  if (schemaObject.maxItems !== undefined) {
+    template.maxItems = schemaObject.maxItems;
   }
 
   return template;