diff --git a/common/changes/office-ui-fabric-react/keco-calendar-keydown-regression_2018-04-24-15-57.json b/common/changes/office-ui-fabric-react/keco-calendar-keydown-regression_2018-04-24-15-57.json
new file mode 100644
index 0000000000000..3816bc46c2f2a
--- /dev/null
+++ b/common/changes/office-ui-fabric-react/keco-calendar-keydown-regression_2018-04-24-15-57.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "office-ui-fabric-react",
+      "comment": "Gate calendar month, year, and today keydowns for only ENTER as onClick handles space with button nodes to fix double date change regression.",
+      "type": "patch"
+    }
+  ],
+  "packageName": "office-ui-fabric-react",
+  "email": "keco@microsoft.com"
+}
\ No newline at end of file
diff --git a/packages/office-ui-fabric-react/src/components/Calendar/Calendar.tsx b/packages/office-ui-fabric-react/src/components/Calendar/Calendar.tsx
index 138bf8b85ccd7..8326b0fc23956 100644
--- a/packages/office-ui-fabric-react/src/components/Calendar/Calendar.tsx
+++ b/packages/office-ui-fabric-react/src/components/Calendar/Calendar.tsx
@@ -260,7 +260,7 @@ export class Calendar extends BaseComponent<ICalendarProps, ICalendarState> impl
   }
 
   private _onGotoTodayKeyDown = (ev: React.KeyboardEvent<HTMLElement>): void => {
-    if (ev.which === KeyCodes.enter || ev.which === KeyCodes.space) {
+    if (ev.which === KeyCodes.enter) {
       ev.preventDefault();
       this._onGotoToday();
     } else if (ev.which === KeyCodes.tab && !ev.shiftKey) {
diff --git a/packages/office-ui-fabric-react/src/components/Calendar/CalendarDay.tsx b/packages/office-ui-fabric-react/src/components/Calendar/CalendarDay.tsx
index a443b150e0fdd..e0493c4cd2f01 100644
--- a/packages/office-ui-fabric-react/src/components/Calendar/CalendarDay.tsx
+++ b/packages/office-ui-fabric-react/src/components/Calendar/CalendarDay.tsx
@@ -566,11 +566,15 @@ export class CalendarDay extends BaseComponent<ICalendarDayProps, ICalendarDaySt
   }
 
   private _onPrevMonthKeyDown = (ev: React.KeyboardEvent<HTMLElement>): void => {
-    this._onKeyDown(this._onSelectPrevMonth, ev);
+    if (ev.which === KeyCodes.enter) {
+      this._onKeyDown(this._onSelectPrevMonth, ev);
+    }
   }
 
   private _onNextMonthKeyDown = (ev: React.KeyboardEvent<HTMLElement>): void => {
-    this._onKeyDown(this._onSelectNextMonth, ev);
+    if (ev.which === KeyCodes.enter) {
+      this._onKeyDown(this._onSelectNextMonth, ev);
+    }
   }
 
   private _getWeeks(propsToUse: ICalendarDayProps): IDayInfo[][] {
diff --git a/packages/office-ui-fabric-react/src/components/Calendar/CalendarMonth.tsx b/packages/office-ui-fabric-react/src/components/Calendar/CalendarMonth.tsx
index 0536048d0c370..24997e311c92f 100644
--- a/packages/office-ui-fabric-react/src/components/Calendar/CalendarMonth.tsx
+++ b/packages/office-ui-fabric-react/src/components/Calendar/CalendarMonth.tsx
@@ -178,7 +178,9 @@ export class CalendarMonth extends BaseComponent<ICalendarMonthProps, {}> {
   }
 
   private _onSelectNextYearKeyDown = (ev: React.KeyboardEvent<HTMLElement>): void => {
-    this._onKeyDown(this._onSelectNextYear, ev);
+    if (ev.which === KeyCodes.enter) {
+      this._onKeyDown(this._onSelectNextYear, ev);
+    }
   }
 
   private _onSelectPrevYear = (): void => {
@@ -187,7 +189,9 @@ export class CalendarMonth extends BaseComponent<ICalendarMonthProps, {}> {
   }
 
   private _onSelectPrevYearKeyDown = (ev: React.KeyboardEvent<HTMLElement>): void => {
-    this._onKeyDown(this._onSelectPrevYear, ev);
+    if (ev.which === KeyCodes.enter) {
+      this._onKeyDown(this._onSelectPrevYear, ev);
+    }
   }
 
   private _onSelectMonth = (newMonth: number): void => {