diff --git a/website/src/heatmap/oracle.js b/website/src/heatmap/oracle.js
index 1f7006bbb..144a3ded2 100644
--- a/website/src/heatmap/oracle.js
+++ b/website/src/heatmap/oracle.js
@@ -71,7 +71,10 @@ function createOracleHeatmapOption(mode, name) {
             yMin: -5,
             yMax: 2,
           }
-        : undefined,
+        : {
+            from: "genesis",
+            to: "today",
+          },
     tooltip: defaultTooltip,
   };
 }
diff --git a/website/src/heatmap/types.js b/website/src/heatmap/types.js
index 2d36a5bd6..4a1ea818d 100644
--- a/website/src/heatmap/types.js
+++ b/website/src/heatmap/types.js
@@ -19,9 +19,11 @@
  * @property {number} start
  * @property {number} end
  *
+ * @typedef {"genesis" | "today" | `${number}`} HeatmapDateKey
+ *
  * @typedef {Object} HeatmapDefaults
- * @property {string} [from]
- * @property {string} [to]
+ * @property {HeatmapDateKey} [from]
+ * @property {HeatmapDateKey} [to]
  * @property {number} [yMin]
  * @property {number} [yMax]
  *