diff --git a/draftlogs/6796_fix.md b/draftlogs/6796_fix.md
new file mode 100644
index 00000000000..dd8aadf0759
--- /dev/null
+++ b/draftlogs/6796_fix.md
@@ -0,0 +1 @@
+ - Fix range defaults to take into account minallowed and maxallowed values [[#6796](https://github.com/plotly/plotly.js/pull/6796)]
diff --git a/src/plots/cartesian/set_convert.js b/src/plots/cartesian/set_convert.js
index e4e41e2548e..14f17f9c2aa 100644
--- a/src/plots/cartesian/set_convert.js
+++ b/src/plots/cartesian/set_convert.js
@@ -447,6 +447,23 @@ module.exports = function setConvert(ax, fullLayout) {
 
         if(minallowed !== undefined && rng[0] < bounds[0]) range[axrev ? 1 : 0] = minallowed;
         if(maxallowed !== undefined && rng[1] > bounds[1]) range[axrev ? 0 : 1] = maxallowed;
+
+        if(range[0] === range[1]) {
+            var minL = ax.l2r(minallowed);
+            var maxL = ax.l2r(maxallowed);
+
+            if(minallowed !== undefined) {
+                var _max = minL + 1;
+                if(maxallowed !== undefined) _max = Math.min(_max, maxL);
+                range[axrev ? 1 : 0] = _max;
+            }
+
+            if(maxallowed !== undefined) {
+                var _min = maxL + 1;
+                if(minallowed !== undefined) _min = Math.max(_min, minL);
+                range[axrev ? 0 : 1] = _min;
+            }
+        }
     };
 
     /*
diff --git a/src/plots/polar/polar.js b/src/plots/polar/polar.js
index fec6113da75..da7da52c1b6 100644
--- a/src/plots/polar/polar.js
+++ b/src/plots/polar/polar.js
@@ -390,6 +390,24 @@ proto.doAutoRange = function(fullLayout, polarLayout) {
         radialAxis.r2l(rng[0], null, 'gregorian'),
         radialAxis.r2l(rng[1], null, 'gregorian')
     ];
+
+    if(radialAxis.minallowed !== undefined) {
+        var minallowed = radialAxis.r2l(radialAxis.minallowed);
+        if(radialAxis._rl[0] > radialAxis._rl[1]) {
+            radialAxis._rl[1] = Math.max(radialAxis._rl[1], minallowed);
+        } else {
+            radialAxis._rl[0] = Math.max(radialAxis._rl[0], minallowed);
+        }
+    }
+
+    if(radialAxis.maxallowed !== undefined) {
+        var maxallowed = radialAxis.r2l(radialAxis.maxallowed);
+        if(radialAxis._rl[0] < radialAxis._rl[1]) {
+            radialAxis._rl[1] = Math.min(radialAxis._rl[1], maxallowed);
+        } else {
+            radialAxis._rl[0] = Math.min(radialAxis._rl[0], maxallowed);
+        }
+    }
 };
 
 proto.updateRadialAxis = function(fullLayout, polarLayout) {
diff --git a/test/image/baselines/zz-allowed-range-small.png b/test/image/baselines/zz-allowed-range-small.png
new file mode 100644
index 00000000000..22e662ea4cd
Binary files /dev/null and b/test/image/baselines/zz-allowed-range-small.png differ
diff --git a/test/image/baselines/zz-allowed-range.png b/test/image/baselines/zz-allowed-range.png
new file mode 100644
index 00000000000..05c73586d37
Binary files /dev/null and b/test/image/baselines/zz-allowed-range.png differ
diff --git a/test/image/mocks/zz-allowed-range-small.json b/test/image/mocks/zz-allowed-range-small.json
new file mode 100644
index 00000000000..c14383fe438
--- /dev/null
+++ b/test/image/mocks/zz-allowed-range-small.json
@@ -0,0 +1,81 @@
+{
+    "data": [
+        {
+            "type": "scatter",
+            "mode": "markers",
+            "xaxis": "x",
+            "yaxis": "y",
+            "x": [0,1,2,3,4,5,6,7,8,9,10],
+            "y":[0,10,20,30,40,50,60,70,80,90,100]
+        },
+        {
+            "type": "scatter",
+            "mode": "markers",
+            "xaxis": "x2",
+            "yaxis": "y2",
+            "x": [0,1,2,3,4,5,6,7,8,9,10],
+            "y":[0,10,20,30,40,50,60,70,80,90,100]
+        },
+        {
+            "type": "scatterpolar",
+            "mode": "markers",
+            "subplot": "polar",
+            "r": [0,1,2,3,4,5,6,7,8,9,10],
+            "theta":[0,10,20,30,40,50,60,70,80,90,100]
+        },
+        {
+            "type": "scatterpolar",
+            "mode": "markers",
+            "subplot": "polar2",
+            "r": [0,1,2,3,4,5,6,7,8,9,10],
+            "theta":[0,10,20,30,40,50,60,70,80,90,100]
+        }
+    ],
+    "layout": {
+        "showlegend": false,
+        "width": 800,
+        "height": 800,
+        "xaxis": {
+            "anchor": "y",
+            "domain": [0, 0.45],
+            "maxallowed": 6.2,
+            "minallowed": 5.8
+        },
+        "yaxis": {
+            "anchor": "x",
+            "domain": [0, 0.45]
+        },
+        "xaxis2": {
+            "autorange": "reversed",
+            "anchor": "y2",
+            "domain": [0, 0.45],
+            "maxallowed": 6.2,
+            "minallowed": 5.8
+        },
+        "yaxis2": {
+            "anchor": "x2",
+            "domain": [0.55, 1]
+        },
+        "polar": {
+            "domain": {
+                "x": [0.55, 1],
+                "y": [0, 0.45]
+            },
+            "radialaxis": {
+                "maxallowed": 6.2,
+                "minallowed": 5.8
+            }
+        },
+        "polar2": {
+            "domain": {
+                "x": [0.55, 1],
+                "y": [0.55, 1]
+            },
+            "radialaxis": {
+                "autorange": "reversed",
+                "maxallowed": 6.2,
+                "minallowed": 5.8
+            }
+        }
+    }
+}
diff --git a/test/image/mocks/zz-allowed-range.json b/test/image/mocks/zz-allowed-range.json
new file mode 100644
index 00000000000..ff3c3762819
--- /dev/null
+++ b/test/image/mocks/zz-allowed-range.json
@@ -0,0 +1,77 @@
+{
+    "data": [
+        {
+            "type": "scatter",
+            "mode": "markers",
+            "xaxis": "x",
+            "yaxis": "y",
+            "x": [0,1,2,3,4,5,6,7,8,9,10],
+            "y":[0,10,20,30,40,50,60,70,80,90,100]
+        },
+        {
+            "type": "scatter",
+            "mode": "markers",
+            "xaxis": "x2",
+            "yaxis": "y2",
+            "x": [0,1,2,3,4,5,6,7,8,9,10],
+            "y":[0,10,20,30,40,50,60,70,80,90,100]
+        },
+        {
+            "type": "scatterpolar",
+            "mode": "markers",
+            "subplot": "polar",
+            "r": [0,1,2,3,4,5,6,7,8,9,10],
+            "theta":[0,10,20,30,40,50,60,70,80,90,100]
+        },
+        {
+            "type": "scatterpolar",
+            "mode": "markers",
+            "subplot": "polar2",
+            "r": [0,1,2,3,4,5,6,7,8,9,10],
+            "theta":[0,10,20,30,40,50,60,70,80,90,100]
+        }
+    ],
+    "layout": {
+        "showlegend": false,
+        "width": 800,
+        "height": 800,
+        "xaxis": {
+            "anchor": "y",
+            "domain": [0, 0.45],
+            "minallowed": 6
+        },
+        "yaxis": {
+            "anchor": "x",
+            "domain": [0, 0.45]
+        },
+        "xaxis2": {
+            "autorange": "reversed",
+            "anchor": "y2",
+            "domain": [0, 0.45],
+            "minallowed": 6
+        },
+        "yaxis2": {
+            "anchor": "x2",
+            "domain": [0.55, 1]
+        },
+        "polar": {
+            "domain": {
+                "x": [0.55, 1],
+                "y": [0, 0.45]
+            },
+            "radialaxis": {
+                "minallowed": 6
+            }
+        },
+        "polar2": {
+            "domain": {
+                "x": [0.55, 1],
+                "y": [0.55, 1]
+            },
+            "radialaxis": {
+                "autorange": "reversed",
+                "minallowed": 6
+            }
+        }
+    }
+}