diff --git a/src/managers/NavigationManager.ts b/src/managers/NavigationManager.ts
index a9f86b6..4fdc1fb 100644
--- a/src/managers/NavigationManager.ts
+++ b/src/managers/NavigationManager.ts
@@ -200,6 +200,9 @@ export class NavigationManager {
       return;
     }
 
+    // Reset all-day height BEFORE creating new grid to ensure base height
+    const root = document.documentElement;
+    root.style.setProperty('--all-day-row-height', '0px');
     
     let newGrid: HTMLElement;
 
@@ -243,10 +246,6 @@ export class NavigationManager {
       newGrid.style.position = 'relative';
       newGrid.removeAttribute('data-prerendered');
       
-      // Reset all-day height and remove hardcoded header height after slide animation
-      const root = document.documentElement;
-      root.style.setProperty('--all-day-row-height', '0px');
-      
       // Update state
       this.currentWeek = new Date(targetWeek);
       this.animationQueue--;