diff --git a/.changeset/wicked-schools-reflect.md b/.changeset/wicked-schools-reflect.md
new file mode 100644
index 0000000000..8fd1a43a28
--- /dev/null
+++ b/.changeset/wicked-schools-reflect.md
@@ -0,0 +1,7 @@
+---
+'@shopify/hydrogen': patch
+---
+
+Update all cart mutation methods from `createCartHandler` to return cart warnings.
+
+As of API version 2024-10, inventory errors about stock levels will no longer be included in the `userErrors` of cart mutations. Inventory errors will now be available in a new return field `warnings` and will contain explicit code values of `MERCHANDISE_NOT_ENOUGH_STOCK`` or MERCHANDISE_OUT_OF_STOCK`. Reference: https://shopify.dev/changelog/cart-warnings-in-storefront-api-cart
diff --git a/packages/hydrogen/src/cart/queries/cart-fragments.ts b/packages/hydrogen/src/cart/queries/cart-fragments.ts
index 6c6f2a4a47..4ae48c7be4 100644
--- a/packages/hydrogen/src/cart/queries/cart-fragments.ts
+++ b/packages/hydrogen/src/cart/queries/cart-fragments.ts
@@ -13,3 +13,11 @@ export const MINIMAL_CART_FRAGMENT = `#graphql
     checkoutUrl
   }
 `;
+
+export const CART_WARNING_FRAGMENT = `#graphql
+  fragment CartApiWarning on CartWarning {
+    code
+    message
+    target
+  }
+`;
diff --git a/packages/hydrogen/src/cart/queries/cart-types.ts b/packages/hydrogen/src/cart/queries/cart-types.ts
index 27bd49197d..ce5bdd07e1 100644
--- a/packages/hydrogen/src/cart/queries/cart-types.ts
+++ b/packages/hydrogen/src/cart/queries/cart-types.ts
@@ -7,6 +7,7 @@ import type {
   CartUserError,
   MetafieldsSetUserError,
   MetafieldDeleteUserError,
+  CartWarning,
 } from '@shopify/hydrogen-react/storefront-api-types';
 import type {StorefrontApiErrors, Storefront} from '../../storefront';
 import {CustomerAccount} from '../../customer/types';
@@ -60,6 +61,7 @@ export type CartQueryData = {
     | CartUserError[]
     | MetafieldsSetUserError[]
     | MetafieldDeleteUserError[];
+  warnings?: CartWarning[];
 };
 
 export type CartQueryDataReturn = CartQueryData & {
diff --git a/packages/hydrogen/src/cart/queries/cartAttributesUpdateDefault.ts b/packages/hydrogen/src/cart/queries/cartAttributesUpdateDefault.ts
index 3cc8fa70cf..4bd821e262 100644
--- a/packages/hydrogen/src/cart/queries/cartAttributesUpdateDefault.ts
+++ b/packages/hydrogen/src/cart/queries/cartAttributesUpdateDefault.ts
@@ -1,5 +1,9 @@
 import {StorefrontApiErrors, formatAPIResult} from '../../storefront';
-import {MINIMAL_CART_FRAGMENT, USER_ERROR_FRAGMENT} from './cart-fragments';
+import {
+  CART_WARNING_FRAGMENT,
+  MINIMAL_CART_FRAGMENT,
+  USER_ERROR_FRAGMENT,
+} from './cart-fragments';
 import type {
   CartOptionalInput,
   CartQueryData,
@@ -44,8 +48,12 @@ export const CART_ATTRIBUTES_UPDATE_MUTATION = (
       userErrors {
         ...CartApiError
       }
+      warnings {
+        ...CartApiWarning
+      }
     }
   }
   ${cartFragment}
   ${USER_ERROR_FRAGMENT}
+  ${CART_WARNING_FRAGMENT}
 `;
diff --git a/packages/hydrogen/src/cart/queries/cartBuyerIdentityUpdateDefault.ts b/packages/hydrogen/src/cart/queries/cartBuyerIdentityUpdateDefault.ts
index 0321723f5d..2104c81fa6 100644
--- a/packages/hydrogen/src/cart/queries/cartBuyerIdentityUpdateDefault.ts
+++ b/packages/hydrogen/src/cart/queries/cartBuyerIdentityUpdateDefault.ts
@@ -1,5 +1,9 @@
 import {StorefrontApiErrors, formatAPIResult} from '../../storefront';
-import {MINIMAL_CART_FRAGMENT, USER_ERROR_FRAGMENT} from './cart-fragments';
+import {
+  CART_WARNING_FRAGMENT,
+  MINIMAL_CART_FRAGMENT,
+  USER_ERROR_FRAGMENT,
+} from './cart-fragments';
 import type {
   CartOptionalInput,
   CartQueryData,
@@ -61,8 +65,12 @@ export const CART_BUYER_IDENTITY_UPDATE_MUTATION = (
       userErrors {
         ...CartApiError
       }
+      warnings {
+        ...CartApiWarning
+      }
     }
   }
   ${cartFragment}
   ${USER_ERROR_FRAGMENT}
+  ${CART_WARNING_FRAGMENT}
 `;
diff --git a/packages/hydrogen/src/cart/queries/cartCreateDefault.ts b/packages/hydrogen/src/cart/queries/cartCreateDefault.ts
index 78a57efe60..2968f30605 100644
--- a/packages/hydrogen/src/cart/queries/cartCreateDefault.ts
+++ b/packages/hydrogen/src/cart/queries/cartCreateDefault.ts
@@ -1,5 +1,9 @@
 import {StorefrontApiErrors, formatAPIResult} from '../../storefront';
-import {MINIMAL_CART_FRAGMENT, USER_ERROR_FRAGMENT} from './cart-fragments';
+import {
+  CART_WARNING_FRAGMENT,
+  MINIMAL_CART_FRAGMENT,
+  USER_ERROR_FRAGMENT,
+} from './cart-fragments';
 import type {
   CartQueryData,
   CartQueryOptions,
@@ -58,8 +62,12 @@ export const CART_CREATE_MUTATION = (
       userErrors {
         ...CartApiError
       }
+      warnings {
+        ...CartApiWarning
+      }
     }
   }
   ${cartFragment}
   ${USER_ERROR_FRAGMENT}
+  ${CART_WARNING_FRAGMENT}
 `;
diff --git a/packages/hydrogen/src/cart/queries/cartDiscountCodesUpdateDefault.ts b/packages/hydrogen/src/cart/queries/cartDiscountCodesUpdateDefault.ts
index 4d8bd578e0..68976207fb 100644
--- a/packages/hydrogen/src/cart/queries/cartDiscountCodesUpdateDefault.ts
+++ b/packages/hydrogen/src/cart/queries/cartDiscountCodesUpdateDefault.ts
@@ -1,5 +1,9 @@
 import {StorefrontApiErrors, formatAPIResult} from '../../storefront';
-import {MINIMAL_CART_FRAGMENT, USER_ERROR_FRAGMENT} from './cart-fragments';
+import {
+  CART_WARNING_FRAGMENT,
+  MINIMAL_CART_FRAGMENT,
+  USER_ERROR_FRAGMENT,
+} from './cart-fragments';
 import type {
   CartOptionalInput,
   CartQueryData,
@@ -52,8 +56,12 @@ export const CART_DISCOUNT_CODE_UPDATE_MUTATION = (
       userErrors {
         ...CartApiError
       }
+      warnings {
+        ...CartApiWarning
+      }
     }
   }
   ${cartFragment}
   ${USER_ERROR_FRAGMENT}
+  ${CART_WARNING_FRAGMENT}
 `;
diff --git a/packages/hydrogen/src/cart/queries/cartGiftCardCodeUpdateDefault.ts b/packages/hydrogen/src/cart/queries/cartGiftCardCodeUpdateDefault.ts
index 60bdd6cf90..7a51b88c64 100644
--- a/packages/hydrogen/src/cart/queries/cartGiftCardCodeUpdateDefault.ts
+++ b/packages/hydrogen/src/cart/queries/cartGiftCardCodeUpdateDefault.ts
@@ -1,5 +1,9 @@
 import {StorefrontApiErrors, formatAPIResult} from '../../storefront';
-import {MINIMAL_CART_FRAGMENT, USER_ERROR_FRAGMENT} from './cart-fragments';
+import {
+  CART_WARNING_FRAGMENT,
+  MINIMAL_CART_FRAGMENT,
+  USER_ERROR_FRAGMENT,
+} from './cart-fragments';
 import type {
   CartOptionalInput,
   CartQueryData,
@@ -52,8 +56,12 @@ export const CART_GIFT_CARD_CODE_UPDATE_MUTATION = (
       userErrors {
         ...CartApiError
       }
+      warnings {
+        ...CartApiWarning
+      }
     }
   }
   ${cartFragment}
   ${USER_ERROR_FRAGMENT}
+  ${CART_WARNING_FRAGMENT}
 `;
diff --git a/packages/hydrogen/src/cart/queries/cartLinesAddDefault.ts b/packages/hydrogen/src/cart/queries/cartLinesAddDefault.ts
index 19fc13d053..0bca0be04b 100644
--- a/packages/hydrogen/src/cart/queries/cartLinesAddDefault.ts
+++ b/packages/hydrogen/src/cart/queries/cartLinesAddDefault.ts
@@ -1,6 +1,10 @@
 import type {CartLineInput} from '@shopify/hydrogen-react/storefront-api-types';
 import {StorefrontApiErrors, formatAPIResult} from '../../storefront';
-import {MINIMAL_CART_FRAGMENT, USER_ERROR_FRAGMENT} from './cart-fragments';
+import {
+  CART_WARNING_FRAGMENT,
+  MINIMAL_CART_FRAGMENT,
+  USER_ERROR_FRAGMENT,
+} from './cart-fragments';
 import type {
   CartOptionalInput,
   CartQueryData,
@@ -49,9 +53,12 @@ export const CART_LINES_ADD_MUTATION = (
       userErrors {
         ...CartApiError
       }
+      warnings {
+        ...CartApiWarning
+      }
     }
   }
-
   ${cartFragment}
   ${USER_ERROR_FRAGMENT}
+  ${CART_WARNING_FRAGMENT}
 `;
diff --git a/packages/hydrogen/src/cart/queries/cartLinesRemoveDefault.ts b/packages/hydrogen/src/cart/queries/cartLinesRemoveDefault.ts
index 334cdf04d2..9cd146ad5d 100644
--- a/packages/hydrogen/src/cart/queries/cartLinesRemoveDefault.ts
+++ b/packages/hydrogen/src/cart/queries/cartLinesRemoveDefault.ts
@@ -1,6 +1,10 @@
 import {StorefrontApiErrors, formatAPIResult} from '../../storefront';
 import {throwIfLinesAreOptimistic} from '../optimistic/optimistic-cart.helper';
-import {MINIMAL_CART_FRAGMENT, USER_ERROR_FRAGMENT} from './cart-fragments';
+import {
+  CART_WARNING_FRAGMENT,
+  MINIMAL_CART_FRAGMENT,
+  USER_ERROR_FRAGMENT,
+} from './cart-fragments';
 import type {
   CartOptionalInput,
   CartQueryData,
@@ -50,9 +54,12 @@ export const CART_LINES_REMOVE_MUTATION = (
       userErrors {
         ...CartApiError
       }
+      warnings {
+        ...CartApiWarning
+      }
     }
   }
-
   ${cartFragment}
   ${USER_ERROR_FRAGMENT}
+  ${CART_WARNING_FRAGMENT}
 `;
diff --git a/packages/hydrogen/src/cart/queries/cartLinesUpdateDefault.ts b/packages/hydrogen/src/cart/queries/cartLinesUpdateDefault.ts
index dc66daca17..b9f28ed5e7 100644
--- a/packages/hydrogen/src/cart/queries/cartLinesUpdateDefault.ts
+++ b/packages/hydrogen/src/cart/queries/cartLinesUpdateDefault.ts
@@ -1,6 +1,10 @@
 import {StorefrontApiErrors, formatAPIResult} from '../../storefront';
 import {throwIfLinesAreOptimistic} from '../optimistic/optimistic-cart.helper';
-import {MINIMAL_CART_FRAGMENT, USER_ERROR_FRAGMENT} from './cart-fragments';
+import {
+  CART_WARNING_FRAGMENT,
+  MINIMAL_CART_FRAGMENT,
+  USER_ERROR_FRAGMENT,
+} from './cart-fragments';
 import type {
   CartOptionalInput,
   CartQueryData,
@@ -51,9 +55,12 @@ export const CART_LINES_UPDATE_MUTATION = (
       userErrors {
         ...CartApiError
       }
+      warnings {
+        ...CartApiWarning
+      }
     }
   }
-
   ${cartFragment}
   ${USER_ERROR_FRAGMENT}
+  ${CART_WARNING_FRAGMENT}
 `;
diff --git a/packages/hydrogen/src/cart/queries/cartNoteUpdateDefault.ts b/packages/hydrogen/src/cart/queries/cartNoteUpdateDefault.ts
index b4e1170d92..6c653d9b73 100644
--- a/packages/hydrogen/src/cart/queries/cartNoteUpdateDefault.ts
+++ b/packages/hydrogen/src/cart/queries/cartNoteUpdateDefault.ts
@@ -1,5 +1,9 @@
 import {StorefrontApiErrors, formatAPIResult} from '../../storefront';
-import {MINIMAL_CART_FRAGMENT, USER_ERROR_FRAGMENT} from './cart-fragments';
+import {
+  CART_WARNING_FRAGMENT,
+  MINIMAL_CART_FRAGMENT,
+  USER_ERROR_FRAGMENT,
+} from './cart-fragments';
 import type {
   CartOptionalInput,
   CartQueryData,
@@ -47,8 +51,12 @@ export const CART_NOTE_UPDATE_MUTATION = (
       userErrors {
         ...CartApiError
       }
+      warnings {
+        ...CartApiWarning
+      }
     }
   }
   ${cartFragment}
   ${USER_ERROR_FRAGMENT}
+  ${CART_WARNING_FRAGMENT}
 `;
diff --git a/packages/hydrogen/src/cart/queries/cartSelectedDeliveryOptionsUpdateDefault.ts b/packages/hydrogen/src/cart/queries/cartSelectedDeliveryOptionsUpdateDefault.ts
index d85132d426..04c4b8ff43 100644
--- a/packages/hydrogen/src/cart/queries/cartSelectedDeliveryOptionsUpdateDefault.ts
+++ b/packages/hydrogen/src/cart/queries/cartSelectedDeliveryOptionsUpdateDefault.ts
@@ -1,5 +1,9 @@
 import {StorefrontApiErrors, formatAPIResult} from '../../storefront';
-import {MINIMAL_CART_FRAGMENT, USER_ERROR_FRAGMENT} from './cart-fragments';
+import {
+  CART_WARNING_FRAGMENT,
+  MINIMAL_CART_FRAGMENT,
+  USER_ERROR_FRAGMENT,
+} from './cart-fragments';
 import type {
   CartOptionalInput,
   CartQueryData,
@@ -49,8 +53,12 @@ export const CART_SELECTED_DELIVERY_OPTIONS_UPDATE_MUTATION = (
       userErrors {
         ...CartApiError
       }
+      warnings {
+        ...CartApiWarning
+      }
     }
   }
   ${cartFragment}
   ${USER_ERROR_FRAGMENT}
+  ${CART_WARNING_FRAGMENT}
 `;
diff --git a/templates/skeleton/app/routes/cart.tsx b/templates/skeleton/app/routes/cart.tsx
index 341667b1f9..61d0a0ea00 100644
--- a/templates/skeleton/app/routes/cart.tsx
+++ b/templates/skeleton/app/routes/cart.tsx
@@ -74,7 +74,7 @@ export async function action({request, context}: ActionFunctionArgs) {
 
   const cartId = result?.cart?.id;
   const headers = cartId ? cart.setCartId(result.cart.id) : new Headers();
-  const {cart: cartResult, errors} = result;
+  const {cart: cartResult, errors, warnings} = result;
 
   const redirectTo = formData.get('redirectTo') ?? null;
   if (typeof redirectTo === 'string') {
@@ -86,6 +86,7 @@ export async function action({request, context}: ActionFunctionArgs) {
     {
       cart: cartResult,
       errors,
+      warnings,
       analytics: {
         cartId,
       },