diff --git a/symposion/proposals/models.py b/symposion/proposals/models.py
index cf852b48..6d1603c3 100644
--- a/symposion/proposals/models.py
+++ b/symposion/proposals/models.py
@@ -44,6 +44,16 @@ class ProposalSection(models.Model):
             Q(closed=False) | Q(closed=None),
         )
     
+    def is_available(self):
+        if self.closed:
+            return False
+        now = datetime.datetime.now()
+        if self.start and self.start > now:
+            return False
+        if self.end and self.end < now:
+            return False
+        return True
+    
     def __unicode__(self):
         return self.section.name
 
diff --git a/symposion/proposals/views.py b/symposion/proposals/views.py
index fd5e210c..8cfdfa04 100644
--- a/symposion/proposals/views.py
+++ b/symposion/proposals/views.py
@@ -59,6 +59,9 @@ def proposal_submit_kind(request, kind_slug):
         except ObjectDoesNotExist:
             return redirect("dashboard")
     
+    if not kind.section.proposalsection.is_available():
+        return redirect("proposal_submit")
+    
     form_class = get_form(settings.PROPOSAL_FORMS[kind_slug])
     
     if request.method == "POST":