diff --git a/docs/CURRENT-STATE.md b/docs/CURRENT-STATE.md
index f1244947d..e954ae082 100644
--- a/docs/CURRENT-STATE.md
+++ b/docs/CURRENT-STATE.md
@@ -4239,6 +4239,10 @@ by `scripts/qa-emergency-squawk.mjs`. Both accept `--timeout-ms` for slow boot.
 
 Fire Perimeters uses capped, timed server reads with stale-on-error caching and a per-client limit. A stale snapshot is served for at most 24 hours; the layer row then reads STALE, dated by that snapshot's fetch, and `get_fire_perimeters` returns `stale` and `retrieved_at` with "(data may be stale)" in its summary. Unchanged snapshots retain geometry; link checks cancel on disable or selection change, and the row legend shows reported containment.
 
+The incident card rounds the WFIGS size to whole acres, except under one acre,
+where it keeps the reported hundredths: a 0.25-acre fire reads `0.25 ac`, not
+`0 ac`.
+
 Prohibited & Restricted Airspace is off by default (share-link token `8`) and sits in
 Infrastructure. The proxy pages `TYPE_CODE IN ('P','R')` from the FAA SUA
 FeatureServer, caps the body, and reuses a one-hour snapshot, serving the last
diff --git a/src/layers/perimeters/cards.js b/src/layers/perimeters/cards.js
index aef5913ce..a6cb3ac4d 100644
--- a/src/layers/perimeters/cards.js
+++ b/src/layers/perimeters/cards.js
@@ -159,7 +159,10 @@ export function buildIncidentCard(row, nowMs, { link = null } = {}) {
   // the known cause, behavior and complexity values and the wording around them.
   const facts = [];
   if (Number.isFinite(row.acres)) {
-    const acres = Math.round(row.acres);
+    // WFIGS reports sizes to the hundredth of an acre; a fire under one acre
+    // keeps them rather than reading "0 ac".
+    const acres =
+      row.acres < 1 ? Math.round(row.acres * 100) / 100 : Math.round(row.acres);
     facts.push(
       tn(acres, '{acres} ac', '{acres} ac', { acres: formatNumber(acres) }),
     );
diff --git a/src/layers/perimeters/cards.test.mjs b/src/layers/perimeters/cards.test.mjs
index 0e064bff0..fe4aac06b 100644
--- a/src/layers/perimeters/cards.test.mjs
+++ b/src/layers/perimeters/cards.test.mjs
@@ -302,3 +302,34 @@ test('partial incident details render only the facts that exist', () => {
     'Catron County · $85K to date',
   ]);
 });
+
+test('a fire under one acre keeps its WFIGS size instead of reading 0 ac', () => {
+  const row = {
+    stableId: 'x',
+    name: 'Grey',
+    acres: 0.25,
+    containedPct: null,
+    state: 'US-WA',
+    category: 'WF',
+    discoveredTime: null,
+    updatedTime: null,
+    cause: null,
+    behavior: null,
+    personnel: null,
+    county: null,
+    costToDate: null,
+    complexity: null,
+  };
+  assert.equal(
+    buildIncidentCard(row, 1758000000000).details[0],
+    '0.25 ac · containment unknown · US-WA',
+  );
+  assert.equal(
+    buildIncidentCard({ ...row, acres: 0.01 }, 1758000000000).details[0],
+    '0.01 ac · containment unknown · US-WA',
+  );
+  assert.equal(
+    buildIncidentCard({ ...row, acres: 1.4 }, 1758000000000).details[0],
+    '1 ac · containment unknown · US-WA',
+  );
+});