diff --git a/public/app.css b/public/app.css
index bf53f60..0906692 100644
--- a/public/app.css
+++ b/public/app.css
@@ -4422,3 +4422,9 @@ select.f {
 .planner-page .header-row-top {
 	max-width: 100%;
 }
+
+.delete-plan-dialog { width: min(500px, 94vw); }
+#delete-plan-name { font-weight: 700; overflow-wrap: anywhere; }
+#delete-plan-description { line-height: 1.6; }
+#delete-plan-error { color: #a32920; }
+.delete-plan-actions { display: flex; justify-content: flex-end; gap: 12px; margin-top: 24px; }
diff --git a/public/js/plans.js b/public/js/plans.js
index fc700e1..5f95426 100644
--- a/public/js/plans.js
+++ b/public/js/plans.js
@@ -18,6 +18,41 @@ function node(tag, text, className = "") {
 	el.className = className;
 	return el;
 }
+const deleteDialog = document.getElementById("delete-plan-dialog"),
+	deleteName = document.getElementById("delete-plan-name"),
+	deleteError = document.getElementById("delete-plan-error"),
+	deleteConfirm = document.getElementById("delete-plan-confirm"),
+	deleteCancel = document.getElementById("delete-plan-cancel");
+let pendingDelete = null, deleting = false;
+deleteCancel.onclick = () => deleteDialog.close();
+deleteDialog.addEventListener("cancel", (event) => {
+	if (deleting) event.preventDefault();
+});
+deleteDialog.addEventListener("close", () => { pendingDelete = null; });
+deleteConfirm.onclick = async () => {
+	if (!pendingDelete || deleting) return;
+	deleting = true;
+	deleteConfirm.disabled = deleteCancel.disabled = true;
+	deleteConfirm.textContent = "Deleting…";
+	deleteError.textContent = "";
+	try {
+		try {
+			await api("/api/plans/" + pendingDelete.id, { method: "DELETE" });
+		} catch (error) {
+			// Another tab may already have removed this plan.
+			if (error.status !== 404) throw error;
+		}
+		deleteDialog.close();
+		await load();
+		showToast("Plan deleted.");
+	} catch (error) {
+		deleteError.textContent = "Could not delete this plan. " + error.message + " Try again.";
+	} finally {
+		deleting = false;
+		deleteConfirm.disabled = deleteCancel.disabled = false;
+		deleteConfirm.textContent = "Delete plan";
+	}
+};
 async function load() {
 	const current = ++generation;
 	const params = new URLSearchParams(new FormData(form));
@@ -92,14 +127,11 @@ async function load() {
 			const remove = node("button", "Delete", "ghost-btn small");
 			remove.type = "button";
 			remove.setAttribute("aria-label", "Delete " + plan.title);
-			remove.onclick = async () => {
-				if (!confirm(`Delete “${plan.title}”?`)) return;
-				try {
-					await api("/api/plans/" + plan.id, { method: "DELETE" });
-					await load();
-				} catch (e) {
-					showToast(e.message, "fail");
-				}
+			remove.onclick = () => {
+				pendingDelete = plan;
+				deleteName.textContent = plan.title;
+				deleteError.textContent = "";
+				deleteDialog.showModal();
 			};
 			actions.append(clone, rename, remove);
 			tr.append(actions);
diff --git a/public/plans.html b/public/plans.html
index 550b559..d5b8bf2 100644
--- a/public/plans.html
+++ b/public/plans.html
@@ -151,6 +151,16 @@
         </main>
       </div>
     </div>
+    <dialog id="delete-plan-dialog" class="workspace-dialog delete-plan-dialog" aria-labelledby="delete-plan-heading" aria-describedby="delete-plan-description">
+      <h2 id="delete-plan-heading">Delete this plan?</h2>
+      <p id="delete-plan-name"></p>
+      <p id="delete-plan-description">This removes the saved plan and its revision history. Completed roast records and inventory history will be kept. This cannot be undone.</p>
+      <p id="delete-plan-error" role="alert"></p>
+      <div class="delete-plan-actions">
+        <button type="button" class="ghost-btn" id="delete-plan-cancel" autofocus>Cancel</button>
+        <button type="button" class="primary-btn" id="delete-plan-confirm">Delete plan</button>
+      </div>
+    </dialog>
     <script type="module" src="/js/plans.js?v=__ASSET_VERSION__"></script>
   </body>
 </html>
diff --git a/test/report-browser.test.js b/test/report-browser.test.js
index 19628be..d8d084e 100644
--- a/test/report-browser.test.js
+++ b/test/report-browser.test.js
@@ -717,3 +717,47 @@ test(
 		assert.deepEqual(errors, []);
 	},
 );
+
+test("browser: deleting a plan confirms in-page, supports retry, and preserves roast records", browserOptions, async (t) => {
+	const { page, base, create, db, csrfToken, errors } = await session(t);
+	const plan = blankPlan();
+	const saved = await create(plan, "Burundi — previous light roast plan");
+	const keep = await create(plan, "Keep this plan");
+	await page.request.put(base + "/api/plans/" + saved.id, {
+		headers: { "x-csrf-token": csrfToken }, data: { name: "Burundi — previous light roast plan revised" },
+	});
+	const owner = (await db.query("SELECT user_id FROM roast_plans WHERE id=$1", [saved.id])).rows[0].user_id;
+	const roast = (await db.query("INSERT INTO actual_roasts(user_id,roast_plan_id,filename,original_content,parsed,plan_snapshot) VALUES($1,$2,'saved.alog','{}',$3,$4) RETURNING id", [owner,saved.id,{roast:{}},plan])).rows[0];
+	// Browser popup suppression must not turn Delete into a silent no-op.
+	await page.addInitScript(() => { window.confirm = () => false; });
+	await page.goto(base + "/plans");
+	const remove = page.getByRole("button", {name: "Delete Burundi — previous light roast plan revised", exact:true});
+	await remove.click();
+	const dialog = page.getByRole("dialog", {name:"Delete this plan?"});
+	await dialog.waitFor();
+	await page.screenshot({path:"/tmp/delete-plan-desktop.png"});
+	await page.setViewportSize({width:390,height:844});
+	await page.screenshot({path:"/tmp/delete-plan-mobile.png"});
+	assert.equal(await page.evaluate(() => document.documentElement.scrollWidth <= innerWidth), true);
+	await dialog.getByRole("button",{name:"Cancel",exact:true}).click();
+	assert.equal((await page.request.get(base + "/api/plans/" + saved.id)).status(),200);
+	await remove.click();
+	await page.route("**/api/plans/" + saved.id, async (route) => {
+		if (route.request().method() === "DELETE") await route.fulfill({status:503,contentType:"application/json",body:JSON.stringify({error:"Temporary service failure"})});
+		else await route.continue();
+	});
+	await dialog.getByRole("button",{name:"Delete plan",exact:true}).click();
+	await page.getByRole("alert").filter({hasText:"Temporary service failure"}).waitFor();
+	assert.equal(await dialog.isVisible(),true);
+	await page.unroute("**/api/plans/" + saved.id);
+	await dialog.getByRole("button",{name:"Delete plan",exact:true}).click();
+	await dialog.waitFor({state:"hidden"});
+	await page.waitForFunction(() => document.getElementById("plans-status").textContent === "1–1 of 1 plans");
+	assert.equal((await page.request.get(base + "/api/plans/" + saved.id)).status(),404);
+	assert.equal((await page.request.get(base + "/api/plans/" + keep.id)).status(),200);
+	assert.equal((await db.query("SELECT * FROM plan_revisions WHERE plan_id=$1",[saved.id])).rows.length,0);
+	const remaining = (await db.query("SELECT * FROM actual_roasts WHERE id=$1",[roast.id])).rows[0];
+	assert.equal(remaining.roast_plan_id,null);
+	assert.deepEqual(remaining.plan_snapshot,plan);
+	assert.deepEqual(errors,[]);
+});