diff --git a/backend/src/app.ts b/backend/src/app.ts
index 60b3cf4..f45ec70 100644
--- a/backend/src/app.ts
+++ b/backend/src/app.ts
@@ -318,6 +318,15 @@ const weightSchema = z.object({
   recordedOn: dateStringSchema,
   notes: z.string().trim().max(280).optional().or(z.literal('')),
 });
+const weightEditWindowDays = 3;
+
+const getWeightEditEarliestDate = () => {
+  const earliestDate = new Date();
+  earliestDate.setDate(earliestDate.getDate() - (weightEditWindowDays - 1));
+  return earliestDate.toISOString().slice(0, 10);
+};
+
+const isWeightDateEditable = (recordedOn: string) => recordedOn >= getWeightEditEarliestDate();
 
 const vetVisitSchema = z.object({
   visitedOn: dateStringSchema,
@@ -4176,6 +4185,11 @@ app.put(
         return;
       }
 
+      if (!isWeightDateEditable(parsed.data.recordedOn)) {
+        res.status(409).json({ error: 'Weight entries can only be edited for the last 3 days.' });
+        return;
+      }
+
       const weight = await updateWeightForBird(
         req.params.weightId,
         req.params.birdId,
@@ -4185,7 +4199,7 @@ app.put(
       );
 
       if (!weight) {
-        res.status(404).json({ error: 'Weight entry not found.' });
+        res.status(404).json({ error: 'Weight entry not found or no longer editable.' });
         return;
       }
 
diff --git a/backend/src/repositories/birdRepository.ts b/backend/src/repositories/birdRepository.ts
index 4300874..ce7ecc7 100644
--- a/backend/src/repositories/birdRepository.ts
+++ b/backend/src/repositories/birdRepository.ts
@@ -909,6 +909,7 @@ export const updateWeightForBird = async (
          notes = $5
      WHERE id = $1
        AND bird_id = $2
+       AND recorded_on >= CURRENT_DATE - (2 * INTERVAL '1 day')
      RETURNING id, bird_id, weight_grams, recorded_on::text, notes`,
     [weightId, birdId, weightGrams, recordedOn, notes],
   );
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 730e6e5..d669276 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -917,6 +917,13 @@ const formatAuditAction = (value: string) =>
 const formatWeight = (value: number | null) => (value ? `${value.toFixed(1)} g` : 'Pending');
 const formatRange = (minGrams: number, maxGrams: number) => `${minGrams.toFixed(0)}-${maxGrams.toFixed(0)} g`;
 const parseDateValue = (value: string) => new Date(`${value}T00:00:00`);
+const WEIGHT_EDIT_WINDOW_DAYS = 3;
+const getWeightEditEarliestDate = () => {
+  const earliestDate = new Date();
+  earliestDate.setDate(earliestDate.getDate() - (WEIGHT_EDIT_WINDOW_DAYS - 1));
+  return earliestDate.toISOString().slice(0, 10);
+};
+const isWeightEditable = (weight: WeightRecord) => weight.recordedOn >= getWeightEditEarliestDate();
 const daysBetweenDates = (startDate: string, endDate: string) =>
   Math.abs(parseDateValue(endDate).getTime() - parseDateValue(startDate).getTime()) / (24 * 60 * 60 * 1000);
 const addYearsToDate = (date: Date, years: number) => {
@@ -3685,6 +3692,11 @@ function App() {
   };
 
   const handleEditWeight = (weight: WeightRecord) => {
+    if (!isWeightEditable(weight)) {
+      setError('Weight entries can only be edited for the last 3 days.');
+      return;
+    }
+
     setEditingWeightId(weight.id);
     setWeightForm({
       weightGrams: String(weight.weightGrams),
@@ -7054,11 +7066,12 @@ function App() {
                       <label>
                         Recorded on
                         <input
-                          type="date"
-                          value={weightForm.recordedOn}
-                          onChange={(event) => setWeightForm({ ...weightForm, recordedOn: event.target.value })}
-                          required
-                        />
+	                          type="date"
+	                          value={weightForm.recordedOn}
+	                          min={editingWeightId ? getWeightEditEarliestDate() : undefined}
+	                          onChange={(event) => setWeightForm({ ...weightForm, recordedOn: event.target.value })}
+	                          required
+	                        />
                       </label>
                       <label className="wide-field">
                         Notes
@@ -7081,20 +7094,28 @@ function App() {
 	                      </div>
 		                    </form>
 		                    <div className="recent-list">
-		                      {[...weights]
-		                        .sort((left, right) => right.recordedOn.localeCompare(left.recordedOn))
-		                        .map((weight) => (
-		                          <article className="vet-visit-card" key={weight.id}>
-		                            <strong>{formatWeight(weight.weightGrams)}</strong>
-		                            <span>{formatDate(weight.recordedOn)}</span>
-		                            <small>{weight.notes || 'No notes recorded.'}</small>
-		                            <div className="button-row">
-		                              <button className="secondary-button" onClick={() => handleEditWeight(weight)} type="button">
-		                                Edit
-		                              </button>
-		                            </div>
-		                          </article>
-		                        ))}
+			                      {[...weights]
+			                        .sort((left, right) => right.recordedOn.localeCompare(left.recordedOn))
+			                        .map((weight) => {
+			                          const weightCanBeEdited = isWeightEditable(weight);
+
+			                          return (
+			                            <article className="vet-visit-card" key={weight.id}>
+			                              <strong>{formatWeight(weight.weightGrams)}</strong>
+			                              <span>{formatDate(weight.recordedOn)}</span>
+			                              <small>{weight.notes || 'No notes recorded.'}</small>
+			                              {weightCanBeEdited ? (
+			                                <div className="button-row">
+			                                  <button className="secondary-button" onClick={() => handleEditWeight(weight)} type="button">
+			                                    Edit
+			                                  </button>
+			                                </div>
+			                              ) : (
+			                                <small>Editing available for the last 3 days only.</small>
+			                              )}
+			                            </article>
+			                          );
+			                        })}
 		                      {!weights.length ? <p className="muted">No weight entries recorded yet.</p> : null}
 		                    </div>
 		                  </section>