diff --git a/docs/release-notes/version-3.1.md b/docs/release-notes/version-3.1.md
index cb8831731..d8e56b1ee 100644
--- a/docs/release-notes/version-3.1.md
+++ b/docs/release-notes/version-3.1.md
@@ -13,6 +13,7 @@
 * [#8187](https://github.com/netbox-community/netbox/issues/8187) - Fix rendering of tags column in object tables
 * [#8191](https://github.com/netbox-community/netbox/issues/8191) - Fix return URL when adding IP addresses to VM interfaces
 * [#8196](https://github.com/netbox-community/netbox/issues/8196) - Fix IndexError exception when viewing large IPv6 prefixes in UI
+* [#8201](https://github.com/netbox-community/netbox/issues/8201) - Custom integer fields should allow negative integers as minimum/maximum values
 
 ---
 
diff --git a/netbox/extras/migrations/0067_customfield_min_max_values.py b/netbox/extras/migrations/0067_customfield_min_max_values.py
new file mode 100644
index 000000000..cec4f6ae0
--- /dev/null
+++ b/netbox/extras/migrations/0067_customfield_min_max_values.py
@@ -0,0 +1,21 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('extras', '0066_customfield_name_validation'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='customfield',
+            name='validation_maximum',
+            field=models.IntegerField(blank=True, null=True),
+        ),
+        migrations.AlterField(
+            model_name='customfield',
+            name='validation_minimum',
+            field=models.IntegerField(blank=True, null=True),
+        ),
+    ]
diff --git a/netbox/extras/models/customfields.py b/netbox/extras/models/customfields.py
index 713ef6c93..8c817ad33 100644
--- a/netbox/extras/models/customfields.py
+++ b/netbox/extras/models/customfields.py
@@ -96,13 +96,13 @@ class CustomField(ChangeLoggedModel):
         default=100,
         help_text='Fields with higher weights appear lower in a form.'
     )
-    validation_minimum = models.PositiveIntegerField(
+    validation_minimum = models.IntegerField(
         blank=True,
         null=True,
         verbose_name='Minimum value',
         help_text='Minimum allowed value (for numeric fields)'
     )
-    validation_maximum = models.PositiveIntegerField(
+    validation_maximum = models.IntegerField(
         blank=True,
         null=True,
         verbose_name='Maximum value',
diff --git a/netbox/extras/tests/test_customfields.py b/netbox/extras/tests/test_customfields.py
index 5a9c4257f..fdabe0fcf 100644
--- a/netbox/extras/tests/test_customfields.py
+++ b/netbox/extras/tests/test_customfields.py
@@ -25,49 +25,68 @@ class CustomFieldTest(TestCase):
     def test_simple_fields(self):
         DATA = (
             {
-                'field_type': CustomFieldTypeChoices.TYPE_TEXT,
-                'field_value': 'Foobar!',
-                'empty_value': '',
+                'field': {
+                    'type': CustomFieldTypeChoices.TYPE_TEXT,
+                },
+                'value': 'Foobar!',
             },
             {
-                'field_type': CustomFieldTypeChoices.TYPE_LONGTEXT,
-                'field_value': 'Text with **Markdown**',
-                'empty_value': '',
+                'field': {
+                    'type': CustomFieldTypeChoices.TYPE_LONGTEXT,
+                },
+                'value': 'Text with **Markdown**',
             },
             {
-                'field_type': CustomFieldTypeChoices.TYPE_INTEGER,
-                'field_value': 0,
-                'empty_value': None,
+                'field': {
+                    'type': CustomFieldTypeChoices.TYPE_INTEGER,
+                },
+                'value': 0,
             },
             {
-                'field_type': CustomFieldTypeChoices.TYPE_INTEGER,
-                'field_value': 42,
-                'empty_value': None,
+                'field': {
+                    'type': CustomFieldTypeChoices.TYPE_INTEGER,
+                    'validation_minimum': 1,
+                    'validation_maximum': 100,
+                },
+                'value': 42,
             },
             {
-                'field_type': CustomFieldTypeChoices.TYPE_BOOLEAN,
-                'field_value': True,
-                'empty_value': None,
+                'field': {
+                    'type': CustomFieldTypeChoices.TYPE_INTEGER,
+                    'validation_minimum': -100,
+                    'validation_maximum': -1,
+                },
+                'value': -42,
             },
             {
-                'field_type': CustomFieldTypeChoices.TYPE_BOOLEAN,
-                'field_value': False,
-                'empty_value': None,
+                'field': {
+                    'type': CustomFieldTypeChoices.TYPE_BOOLEAN,
+                },
+                'value': True,
             },
             {
-                'field_type': CustomFieldTypeChoices.TYPE_DATE,
-                'field_value': '2016-06-23',
-                'empty_value': None,
+                'field': {
+                    'type': CustomFieldTypeChoices.TYPE_BOOLEAN,
+                },
+                'value': False,
             },
             {
-                'field_type': CustomFieldTypeChoices.TYPE_URL,
-                'field_value': 'http://example.com/',
-                'empty_value': '',
+                'field': {
+                    'type': CustomFieldTypeChoices.TYPE_DATE,
+                },
+                'value': '2016-06-23',
             },
             {
-                'field_type': CustomFieldTypeChoices.TYPE_JSON,
-                'field_value': '{"foo": 1, "bar": 2}',
-                'empty_value': 'null',
+                'field': {
+                    'type': CustomFieldTypeChoices.TYPE_URL,
+                },
+                'value': 'http://example.com/',
+            },
+            {
+                'field': {
+                    'type': CustomFieldTypeChoices.TYPE_JSON,
+                },
+                'value': '{"foo": 1, "bar": 2}',
             },
         )
 
@@ -76,7 +95,7 @@ class CustomFieldTest(TestCase):
         for data in DATA:
 
             # Create a custom field
-            cf = CustomField(type=data['field_type'], name='my_field', required=False)
+            cf = CustomField(name='my_field', required=False, **data['field'])
             cf.save()
             cf.content_types.set([obj_type])
 
@@ -85,12 +104,12 @@ class CustomFieldTest(TestCase):
             self.assertIsNone(site.custom_field_data[cf.name])
 
             # Assign a value to the first Site
-            site.custom_field_data[cf.name] = data['field_value']
+            site.custom_field_data[cf.name] = data['value']
             site.save()
 
             # Retrieve the stored value
             site.refresh_from_db()
-            self.assertEqual(site.custom_field_data[cf.name], data['field_value'])
+            self.assertEqual(site.custom_field_data[cf.name], data['value'])
 
             # Delete the stored value
             site.custom_field_data.pop(cf.name)