diff --git a/ui/src/Components/SilenceModal/SilenceForm.js b/ui/src/Components/SilenceModal/SilenceForm.js
index fa231932d..7215d62e4 100644
--- a/ui/src/Components/SilenceModal/SilenceForm.js
+++ b/ui/src/Components/SilenceModal/SilenceForm.js
@@ -102,7 +102,8 @@ const SilenceForm = observer(
 
       event.preventDefault();
 
-      silenceFormStore.data.inProgress = true;
+      if (silenceFormStore.data.isValid)
+        silenceFormStore.data.inProgress = true;
     });
 
     render() {
diff --git a/ui/src/Components/SilenceModal/SilenceForm.test.js b/ui/src/Components/SilenceModal/SilenceForm.test.js
index f0d189c80..538c30756 100644
--- a/ui/src/Components/SilenceModal/SilenceForm.test.js
+++ b/ui/src/Components/SilenceModal/SilenceForm.test.js
@@ -3,7 +3,7 @@ import React from "react";
 import { mount, shallow } from "enzyme";
 
 import { AlertStore } from "Stores/AlertStore";
-import { SilenceFormStore } from "Stores/SilenceFormStore";
+import { SilenceFormStore, NewEmptyMatcher } from "Stores/SilenceFormStore";
 import { SilenceForm } from "./SilenceForm";
 
 let alertStore;
@@ -121,7 +121,22 @@ describe("<SilenceForm /> inputs", () => {
 });
 
 describe("<SilenceForm />", () => {
-  it("calling submit marks form as in progress", () => {
+  it("calling submit doesn't mark form as in progress when form is invalid", () => {
+    const tree = ShallowSilenceForm();
+    tree.simulate("submit", { preventDefault: jest.fn() });
+    expect(silenceFormStore.data.inProgress).toBe(false);
+  });
+
+  it("calling submit marks form as in progress when form is valid", () => {
+    const matcher = NewEmptyMatcher();
+    matcher.name = "job";
+    matcher.values = ["node_exporter"];
+    silenceFormStore.data.matchers = [matcher];
+    silenceFormStore.data.alertmanagers = [
+      { label: "am1", value: "http://example.com" }
+    ];
+    silenceFormStore.data.author = "me@example.com";
+    silenceFormStore.data.comment = "fake silence";
     const tree = ShallowSilenceForm();
     tree.simulate("submit", { preventDefault: jest.fn() });
     expect(silenceFormStore.data.inProgress).toBe(true);
diff --git a/ui/src/Stores/SilenceFormStore.js b/ui/src/Stores/SilenceFormStore.js
index 8ef4d3a31..0d42ac3b6 100644
--- a/ui/src/Stores/SilenceFormStore.js
+++ b/ui/src/Stores/SilenceFormStore.js
@@ -51,6 +51,23 @@ class SilenceFormStore {
       comment: "",
       author: "",
 
+      get isValid() {
+        if (this.alertmanagers.length === 0) return false;
+        if (this.matchers.length === 0) return false;
+        if (
+          this.matchers.filter(
+            m =>
+              m.name === "" ||
+              m.values.length === 0 ||
+              m.values.filter(v => v === "").length > 0
+          ).length > 0
+        )
+          return false;
+        if (this.comment === "") return false;
+        if (this.author === "") return false;
+        return true;
+      },
+
       resetProgress() {
         this.inProgress = false;
       },
@@ -181,6 +198,7 @@ class SilenceFormStore {
       decStart: action.bound,
       incEnd: action.bound,
       decEnd: action.bound,
+      isValid: computed,
       toAlertmanagerPayload: computed,
       toDuration: computed
     },
diff --git a/ui/src/Stores/SilenceFormStore.test.js b/ui/src/Stores/SilenceFormStore.test.js
index 8568e3389..ea690a1d9 100644
--- a/ui/src/Stores/SilenceFormStore.test.js
+++ b/ui/src/Stores/SilenceFormStore.test.js
@@ -1,7 +1,7 @@
 import moment from "moment";
 
 import { MockAlert, MockAlertGroup } from "__mocks__/Alerts.js";
-import { SilenceFormStore } from "./SilenceFormStore";
+import { SilenceFormStore, NewEmptyMatcher } from "./SilenceFormStore";
 
 let store;
 beforeEach(() => {
@@ -129,6 +129,83 @@ describe("SilenceFormStore.data", () => {
   });
 });
 
+const MockAlertmanager = () => ({
+  label: "default",
+  value: "http://localhost"
+});
+
+const MockMatcher = (name, values) => {
+  const matcher = NewEmptyMatcher();
+  matcher.name = name;
+  matcher.values = values;
+  return matcher;
+};
+
+describe("SilenceFormStore.data.isValid", () => {
+  it("isValid returns 'false' if alertmanagers list is empty", () => {
+    store.data.matchers = [MockMatcher("foo", ["bar"])];
+    store.data.author = "me@example.com";
+    store.data.comment = "fake silence";
+    expect(store.data.isValid).toBe(false);
+  });
+
+  it("isValid returns 'false' if matchers list is empty", () => {
+    store.data.alertmanagers = [MockAlertmanager];
+    store.data.matchers = [];
+    store.data.author = "me@example.com";
+    store.data.comment = "fake silence";
+    expect(store.data.isValid).toBe(false);
+  });
+
+  it("isValid returns 'false' if matchers list is pupulated when a matcher without any name", () => {
+    store.data.alertmanagers = [MockAlertmanager];
+    store.data.matchers = [MockMatcher("", ["bar"])];
+    store.data.author = "me@example.com";
+    store.data.comment = "fake silence";
+    expect(store.data.isValid).toBe(false);
+  });
+
+  it("isValid returns 'false' if matchers list is pupulated when a matcher without any value ([])", () => {
+    store.data.alertmanagers = [MockAlertmanager];
+    store.data.matchers = [MockMatcher("foo", [])];
+    store.data.author = "me@example.com";
+    store.data.comment = "fake silence";
+    expect(store.data.isValid).toBe(false);
+  });
+
+  it("isValid returns 'false' if matchers list is pupulated when a matcher with empty value ([''])", () => {
+    store.data.alertmanagers = [MockAlertmanager];
+    store.data.matchers = [MockMatcher("foo", [])];
+    store.data.author = "me@example.com";
+    store.data.comment = "fake silence";
+    expect(store.data.isValid).toBe(false);
+  });
+
+  it("isValid returns 'false' if author is empty", () => {
+    store.data.alertmanagers = [MockAlertmanager];
+    store.data.matchers = [MockMatcher("foo", ["bar"])];
+    store.data.author = "";
+    store.data.comment = "fake silence";
+    expect(store.data.isValid).toBe(false);
+  });
+
+  it("isValid returns 'false' if comment is empty", () => {
+    store.data.alertmanagers = [MockAlertmanager];
+    store.data.matchers = [MockMatcher("foo", ["bar"])];
+    store.data.author = "me@example.com";
+    store.data.comment = "";
+    expect(store.data.isValid).toBe(false);
+  });
+
+  it("isValid returns 'true' if all fileds are set", () => {
+    store.data.alertmanagers = [MockAlertmanager];
+    store.data.matchers = [MockMatcher("foo", ["bar"])];
+    store.data.author = "me@example.com";
+    store.data.comment = "fake silence";
+    expect(store.data.isValid).toBe(true);
+  });
+});
+
 describe("SilenceFormStore.data startsAt & endsAt validation", () => {
   it("toDuration returns correct duration for 5d 0h 1m", () => {
     store.data.startsAt = moment([2000, 1, 1, 0, 0, 0]);