diff --git a/api/src/jobs/cron.ts b/api/src/jobs/cron.ts
index 34442f8..fdcae22 100644
--- a/api/src/jobs/cron.ts
+++ b/api/src/jobs/cron.ts
@@ -10,6 +10,9 @@ export default async function cronRouter(
         case '* * * * *':
             console.log('every minute');
             break;
+        case '0 4 7,14,21,28 * *':
+            await updateThemeparkData(env);
+            break;
         default:
             console.log('its me - the cron router');
             break;
diff --git a/api/src/jobs/update-themepark-data.ts b/api/src/jobs/update-themepark-data.ts
new file mode 100644
index 0000000..c927a3d
--- /dev/null
+++ b/api/src/jobs/update-themepark-data.ts
@@ -0,0 +1,53 @@
+import { getDbEnv } from '../db/client'
+import { themepark } from '../db/schema'
+import { countryCodesDE } from '../lib/countries'
+import fetchData from '../lib/fetch-data'
+
+interface Park {
+    id: string,
+    name: string,
+    land: string
+}
+
+export async function updateThemeparkData(env: Env): Promise<void>{
+    try{
+        // fetch all available themeparks from external API
+        const endpoint = "https://api.wartezeiten.app/v1/parks"
+        const headers = {
+            'language':'de'
+        }
+        const availableThemeparks = await fetchData<Park[]>(endpoint, headers);
+
+        // internal db queries
+        const db = getDbEnv(env);
+        const currentThemeparks = await db.select({
+            apiName: themepark.apiName
+        }).from(themepark);
+
+        let newParks = [];
+
+        for (let park of availableThemeparks){
+            if(currentThemeparks.length == 0 || !currentThemeparks.some(id => id.apiName == park.id)){ // checks if id already exists in db
+                newParks.push({
+                    name: park.name,
+                    apiName: park.id,
+                    countrycode: countryCodesDE[park.land]
+                });
+                console.log(`${park.id} is missing in DB`)
+            }
+        }
+
+        // only run queries, when new parks were found
+        if (newParks.length != 0){
+            // split into multiple batches, to apply with D1's limits
+            const batchSize = 20;
+            for (let i = 0; i < newParks.length; i += batchSize){
+                const batch = newParks.slice(i, i + batchSize);
+                await db.insert(themepark).values(batch);
+            }
+        }
+    }
+    catch(e){
+        console.error(`Failed to update themepark data: ${e}`);
+    }
+}
\ No newline at end of file
diff --git a/api/src/lib/countries.ts b/api/src/lib/countries.ts
new file mode 100644
index 0000000..1e44dbd
--- /dev/null
+++ b/api/src/lib/countries.ts
@@ -0,0 +1,37 @@
+// key value pair countryname (german) to countrycode
+// incomplete list with just the countries from the external api (api.wartezeiten.app)
+export const countryCodesDE: Record<string, string> = {
+	"Belgien":"BE",
+	"Deutschland":"DE",
+	"Dänemark":"DK",
+	"Frankreich":"FR",
+	"Großbritannien":"GB",
+	"Italien":"IT",
+	"Niederlande":"NL",
+	"Polen":"PL",
+	"Schweden":"SE",
+	"Schweiz":"CH",
+	"Spanien":"ES",
+	"Vereinigte Staaten":"US",
+	"Vereinigtes Königreich":"UK",
+	"Österreich":"AT"
+};
+
+export const countryCodesEN: Record<string, string> = {
+	"Austria":"AT",
+	"Belgium":"BE",
+	"Denmark":"DK",
+	"France":"FR",
+	"Germany":"DE",
+	"Great Britain":"GB",
+	"Italy":"IT",
+	"Netherlands":"NL",
+	"Poland":"PL",
+	"Spain":"ES",
+	"Sweden":"SE",
+	"Switzerland":"CH",
+	"United Kingdom":"UK",
+	"United States":"US"
+};
+
+// source: https://de.wikipedia.org/wiki/ISO-3166-1-Kodierliste
diff --git a/api/src/lib/fetch-data.ts b/api/src/lib/fetch-data.ts
new file mode 100644
index 0000000..c2a07bf
--- /dev/null
+++ b/api/src/lib/fetch-data.ts
@@ -0,0 +1,15 @@
+// typesafe api fetch function
+export default async function fetchData<T>(endpoint: string, headers: Record<string, string> = {}, method: string = 'GET'): Promise<T>{
+    async function gatherResponse(response: Response): Promise<T>{
+        return await response.json(); 
+    }
+
+    const response: Response = await fetch(endpoint,  { method: method, headers: headers});
+
+    if (!response.ok){
+        throw new Error(`HTTP error! Status: ${response.status}`);
+    }
+
+    const result: T = await gatherResponse(response);
+    return result;
+}
\ No newline at end of file