diff --git a/config/js/config.js b/config/js/config.js
index 4c753e3a..d9d492cd 100644
--- a/config/js/config.js
+++ b/config/js/config.js
@@ -691,6 +691,12 @@ function initialize() {
                 $("#tab_time #time_initialend").val(
                   cData.time ? cData.time.initialend : "now"
                 );
+                $("#tab_time #time_initialwindowstart").val(
+                  cData.time ? cData.time.initialwindowstart : ""
+                );
+                $("#tab_time #time_initialwindowend").val(
+                  cData.time ? cData.time.initialwindowend : "now"
+                );
 
                 //tools
                 //uncheck all tools
@@ -2194,6 +2200,10 @@ function save(returnJSON) {
     json.time.format = $("#tab_time #time_format").val();
     json.time.initialstart = $("#tab_time #time_initialstart").val();
     json.time.initialend = $("#tab_time #time_initialend").val();
+    json.time.initialwindowstart = $(
+      "#tab_time #time_initialwindowstart"
+    ).val();
+    json.time.initialwindowend = $("#tab_time #time_initialwindowend").val();
 
     //Tools
     for (var i = 0; i < tData.length; i++) {
diff --git a/docs/pages/Configure/Tabs/Time/Time_Tab.md b/docs/pages/Configure/Tabs/Time/Time_Tab.md
index 3c85871b..6bb6d04c 100644
--- a/docs/pages/Configure/Tabs/Time/Time_Tab.md
+++ b/docs/pages/Configure/Tabs/Time/Time_Tab.md
@@ -27,3 +27,27 @@ If enabled and visible, the Time UI will be initially open on the bottom of the
 The time format to be displayed on the Time UI. Uses D3 time format specifiers: https://github.com/d3/d3-time-format
 
 Default: `%Y-%m-%dT%H:%M:%SZ`
+
+## Initial Start Time
+
+The initial start time. Should be before `Initial End Time`.
+
+Default: 1 month before `Initial End Time`
+
+## Initial End Time
+
+The initial end time. Should be after `Initial Start Time`. Use `now` to have the end time be the present.
+
+Default: `now`
+
+## Initial Window Start Time
+
+This does not control the time range for queries. This only allows the initial time window of the time line to differ from just being the Start Time to the End Time. A use-case for this would be to set the window times to fit the full extent of the temporal data but only set the Initial Start and End Times as a subset of that so as not to query everything on load.
+
+Default: `Initial Start Time`
+
+## Initial Window End Time
+
+This does not control the time range for queries. This only allows the initial time window of the time line to differ from just being the Start Time to the End Time. Should be after `Initial Window End Time` Use `now` to have the end time be the present.
+
+Default: `Initial End Time`
diff --git a/src/essence/Ancillary/TimeUI.js b/src/essence/Ancillary/TimeUI.js
index a0d106d1..4ffacf0e 100644
--- a/src/essence/Ancillary/TimeUI.js
+++ b/src/essence/Ancillary/TimeUI.js
@@ -411,6 +411,19 @@ const TimeUI = {
             } else TimeUI._initialEnd = dateStaged
         } else TimeUI._initialEnd = new Date()
 
+        // Initial Timeline window end
+        if (
+            L_.configData.time.initialwindowend != null &&
+            L_.configData.time.initialwindowend != 'now'
+        ) {
+            const dateStaged = new Date(L_.configData.time.initialwindowend)
+            if (dateStaged == 'Invalid Date') {
+                console.warn(
+                    "Invalid 'Initial Window End Time' provided. Defaulting to 'now'."
+                )
+            } else TimeUI._timelineEndTimestamp = dateStaged.getTime()
+        }
+
         // Initial start
         // Start 1 month ago
         TimeUI._initialStart = new Date(TimeUI._initialEnd)
@@ -440,6 +453,21 @@ const TimeUI = {
             } else TimeUI._initialStart = dateStaged
         }
 
+        // Initial Timeline window start
+        if (L_.configData.time.initialwindowstart != null) {
+            const dateStaged = new Date(L_.configData.time.initialwindowstart)
+            if (dateStaged == 'Invalid Date') {
+                console.warn("Invalid 'Initial Window Start Time' provided.")
+            } else if (
+                TimeUI._timelineEndTimestamp == null ||
+                dateStaged.getTime() > TimeUI._timelineEndTimestamp
+            ) {
+                console.warn(
+                    "'Initial Window Start Time' cannot be later than the Initial Window End Time."
+                )
+            } else TimeUI._timelineStartTimestamp = dateStaged.getTime()
+        }
+
         // Initialize the time control times, but don't trigger events
         TimeUI.timeChange(
             TimeUI._initialStart.toISOString(),
diff --git a/views/configure.pug b/views/configure.pug
index ca584482..917412d9 100644
--- a/views/configure.pug
+++ b/views/configure.pug
@@ -505,12 +505,20 @@ script(type='text/javascript' src='config/pre/RefreshAuth.js')
             #time_format_row.input-field.col.s3.push-s2
               input#time_format.validate(type='text' value='%Y-%m-%dT%H:%M:%SZ')
               label(for='time_format') Time Format
+          li.row
             #time_initialstartEl.input-field.col.s3.push-s2
               input#time_initialstart.validate(type='text' value='' title="Parsable time (defaults to a month before the end time)")
               label(for='time_initialstart') Initial Start Time
             #time_initialendEl.input-field.col.s3.push-s2
               input#time_initialend.validate(type='text' value='now' title="Parsable time (default to 'now')")
               label(for='time_initialend') Initial End Time
+          li.row   
+            #time_initialwindowstartEl.input-field.col.s3.push-s2
+              input#time_initialwindowstart.validate(type='text' value='' title="Parsable time (defaults to the Initial Start Time)")
+              label(for='time_initialwindowstart') Initial Timeline Window Start Time
+            #time_initialwindowendEl.input-field.col.s3.push-s2
+              input#time_initialwindowend.validate(type='text' value='now' title="Parsable time (default to the Initial End TIme)")
+              label(for='time_initialwindowend') Initial Timeline Window End Time
 
       #tab_tools.col.s12
         a.helpFromDocs(href='https://nasa-ammos.github.io/MMGIS/configure/tabs/tools' target='__blank' rel='noopener')