diff --git a/packages/deck.gl-geotiff/src/cog-layer.ts b/packages/deck.gl-geotiff/src/cog-layer.ts
index 92c268d1..f58d7c15 100644
--- a/packages/deck.gl-geotiff/src/cog-layer.ts
+++ b/packages/deck.gl-geotiff/src/cog-layer.ts
@@ -202,7 +202,9 @@ export class COGLayer<
       // Clear stale state so renderLayers returns null until the new GeoTIFF is
       // ready
       this.clearState();
-      this._parseGeoTIFF();
+      this._parseGeoTIFF().catch((error: Error) =>
+        this.raiseError(error, "loading GeoTIFF"),
+      );
     }
   }
 
@@ -219,11 +221,17 @@ export class COGLayer<
     const signal = this.state.abortController?.signal;
 
     let geotiff: GeoTIFF;
+    let sourceProjection: ProjectionDefinition;
     try {
       geotiff = await fetchGeoTIFF(this.props.geotiff, {
         concurrencyLimiter: this.props.concurrencyLimiter,
         signal,
       });
+      const crs = geotiff.crs;
+      sourceProjection =
+        typeof crs === "number"
+          ? await this.props.epsgResolver!(crs)
+          : parseWkt(crs);
     } catch (err) {
       // Layer removed mid-open (finalizeState aborted the signal); drop it.
       if (signal?.aborted) {
@@ -231,11 +239,6 @@ export class COGLayer<
       }
       throw err;
     }
-    const crs = geotiff.crs;
-    const sourceProjection =
-      typeof crs === "number"
-        ? await this.props.epsgResolver!(crs)
-        : parseWkt(crs);
 
     if (signal?.aborted) {
       return;
diff --git a/packages/deck.gl-geotiff/src/multi-cog-layer.ts b/packages/deck.gl-geotiff/src/multi-cog-layer.ts
index 7b50a574..ef0697df 100644
--- a/packages/deck.gl-geotiff/src/multi-cog-layer.ts
+++ b/packages/deck.gl-geotiff/src/multi-cog-layer.ts
@@ -384,7 +384,9 @@ export class MultiCOGLayer extends RasterTileLayer<
         sources: null,
         multiDescriptor: null,
       });
-      this._parseAllSources();
+      this._parseAllSources().catch((error: Error) =>
+        this.raiseError(error, "loading COG sources"),
+      );
     }
   }
 
diff --git a/packages/deck.gl-geotiff/tests/cog-layer.test.ts b/packages/deck.gl-geotiff/tests/cog-layer.test.ts
index 2b951866..8f5db54c 100644
--- a/packages/deck.gl-geotiff/tests/cog-layer.test.ts
+++ b/packages/deck.gl-geotiff/tests/cog-layer.test.ts
@@ -77,3 +77,25 @@ describe("COGLayer._onTileUnloadCallback", () => {
     expect(unloadCallback(layer)).toBe(onTileUnload);
   });
 });
+
+describe("COGLayer.updateState", () => {
+  it("raises a GeoTIFF open failure through onError", async () => {
+    const onError = vi.fn((_error: Error) => true);
+    const layer = new COGLayer({
+      id: "cog",
+      geotiff: "https://example.com/x.tif",
+      onError,
+    } as never);
+    vi.spyOn(layer, "clearState").mockImplementation(() => {});
+    vi.spyOn(layer, "_parseGeoTIFF").mockRejectedValue(new Error("boom"));
+
+    layer.updateState({
+      props: layer.props,
+      oldProps: layer.props,
+      changeFlags: { dataChanged: true },
+    } as never);
+
+    await vi.waitFor(() => expect(onError).toHaveBeenCalledOnce());
+    expect(onError.mock.calls[0]?.[0]?.message).toBe("loading GeoTIFF: boom");
+  });
+});
diff --git a/packages/deck.gl-geotiff/tests/multi-cog-layer.test.ts b/packages/deck.gl-geotiff/tests/multi-cog-layer.test.ts
index bc7317ee..39702b01 100644
--- a/packages/deck.gl-geotiff/tests/multi-cog-layer.test.ts
+++ b/packages/deck.gl-geotiff/tests/multi-cog-layer.test.ts
@@ -54,3 +54,27 @@ describe("MultiCOGLayer._onTileUnloadCallback", () => {
     expect(() => cb?.({ content: null })).not.toThrow();
   });
 });
+
+describe("MultiCOGLayer.updateState", () => {
+  it("raises a COG open failure through onError", async () => {
+    const onError = vi.fn((_error: Error) => true);
+    const layer = new MultiCOGLayer({
+      id: "multi",
+      sources: { a: { url: "https://example.com/a.tif" } },
+      onError,
+    } as never);
+    vi.spyOn(layer, "setState").mockImplementation(() => {});
+    vi.spyOn(layer, "_parseAllSources").mockRejectedValue(new Error("boom"));
+
+    layer.updateState({
+      props: layer.props,
+      oldProps: layer.props,
+      changeFlags: { dataChanged: true },
+    } as never);
+
+    await vi.waitFor(() => expect(onError).toHaveBeenCalledOnce());
+    const error = onError.mock.calls[0]?.[0];
+    expect(error?.message).toBe("loading COG sources: boom");
+    expect(error?.cause).toBeInstanceOf(Error);
+  });
+});