diff --git a/src/main/java/ch/zhaw/gartenverwaltung/backgroundtasks/BackgroundTasks.java b/src/main/java/ch/zhaw/gartenverwaltung/backgroundtasks/BackgroundTasks.java
index 96eed67..eea692a 100644
--- a/src/main/java/ch/zhaw/gartenverwaltung/backgroundtasks/BackgroundTasks.java
+++ b/src/main/java/ch/zhaw/gartenverwaltung/backgroundtasks/BackgroundTasks.java
@@ -25,11 +25,12 @@ public class BackgroundTasks extends TimerTask {
 
     private void movePastTasks() throws IOException {
         List<Task> taskList = this.taskList.getTaskList(LocalDate.MIN, LocalDate.now().minusDays(1));
-        taskList.forEach(task -> {
+        for (Task task : taskList) {
             if (!task.isDone()) {
                 task.setNextExecution(LocalDate.now());
+                this.taskList.saveTask(task);
             }
-        });
+        }
     }
 
     public BackgroundTasks(TaskList taskList, CropList cropList, PlantList plantList) {
diff --git a/src/main/java/ch/zhaw/gartenverwaltung/backgroundtasks/weather/WeatherGradenTaskPlanner.java b/src/main/java/ch/zhaw/gartenverwaltung/backgroundtasks/weather/WeatherGradenTaskPlanner.java
index d237a72..4141bea 100644
--- a/src/main/java/ch/zhaw/gartenverwaltung/backgroundtasks/weather/WeatherGradenTaskPlanner.java
+++ b/src/main/java/ch/zhaw/gartenverwaltung/backgroundtasks/weather/WeatherGradenTaskPlanner.java
@@ -9,8 +9,12 @@ import ch.zhaw.gartenverwaltung.types.*;
 
 import java.io.IOException;
 import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
+import static java.util.stream.Collectors.toList;
+
 /**
  * The WeatherGardenTaskPlanner creates Tasks based on weather events and the rain amount from the last days
  *
@@ -43,8 +47,7 @@ public class WeatherGradenTaskPlanner {
     private void getSevereWeatherEvents() throws IOException {
         SevereWeather actualWeather = weatherService.causeSevereWeather(1);
         if (SevereWeather.HAIL.equals(actualWeather)) {
-            //ToDo creates hail task all 3 seconds, pls fix
-            //createPreHailTask();
+            createPreHailTask();
         } else if (SevereWeather.FROST.equals(actualWeather)) {
             createPreFrostTask();
         } else if (SevereWeather.SNOW.equals(actualWeather)) {
@@ -63,11 +66,27 @@ public class WeatherGradenTaskPlanner {
      */
     private void createPreHailTask() throws IOException {
 
-        Task preHailTask = new Task("Hail",
-                                    "During a summer Thunderstorm it could hail heavily. THe Hail could damage the crops. To prevent damage cover the plants with a strong tarpaulin",
-                                    dateSevereWeather.minusDays(1L),dateSevereWeather.plusDays(1L),1L);
-        taskList.saveTask(preHailTask);
+        List<Crop> actualCrops = cropList.getCrops();
 
+        for (Crop crop : actualCrops) {
+            Task preHailTask = new Task("Hail",
+                    "During a summer Thunderstorm it could hail heavily. THe Hail could damage the crops. To prevent damage cover the plants with a strong tarpaulin",
+                    dateSevereWeather,dateSevereWeather.plusDays(1L),crop.getCropId().orElse(-1L));
+
+            List<Task> actualCropTaskList = taskList.getTaskForCrop(crop.getCropId().orElse(-1L));
+            List<Task> hailTasklist = actualCropTaskList.stream().filter(task -> task.getName().equals("Hail")).toList();
+
+            List<Task> hailTaskListAtDate = new ArrayList<>();
+            for (Task task : hailTasklist) {
+                if (task.getStartDate() == (preHailTask.getStartDate())) {
+                    hailTaskListAtDate.add(task);
+                }
+            }
+
+            if(hailTaskListAtDate.isEmpty() && hailTasklist.isEmpty()){
+                taskList.saveTask(preHailTask);
+            }
+        }
     }
 
     /**
@@ -75,10 +94,26 @@ public class WeatherGradenTaskPlanner {
      * @throws IOException If the database cannot be accessed
      */
     private void createPreFrostTask() throws IOException {
-        Task preFrostTask = new Task("Frost",
-                                    "The temperatur falls below zero degrees, cover especially the root with wool",
-                                    dateSevereWeather.minusDays(1L),dateSevereWeather.plusDays(1L),1L);
-        taskList.saveTask(preFrostTask);
+        List<Crop> actualCrops = cropList.getCrops();
+        for (Crop crop : actualCrops) {
+
+            Task preFrostTask = new Task("Frost",
+                    "The temperatur falls below zero degrees, cover especially the root with wool",
+                    dateSevereWeather,dateSevereWeather.plusDays(1L),crop.getCropId().orElse(-1L));
+
+            List<Task> actualCropTaskList = taskList.getTaskForCrop(crop.getCropId().orElse(-1L));
+            List<Task> frostTasklist = actualCropTaskList.stream().filter(task -> task.getName().equals("Frost")).toList();
+
+            List<Task> frostTaskListAtDate = new ArrayList<>();
+            for (Task task : frostTasklist) {
+                if (task.getStartDate() == preFrostTask.getStartDate()) {
+                    frostTaskListAtDate.add(task);
+                }
+            }
+            if(frostTaskListAtDate.isEmpty() && frostTasklist.isEmpty()){
+                taskList.saveTask(preFrostTask);
+            }
+        }
     }
 
     /**
@@ -86,10 +121,27 @@ public class WeatherGradenTaskPlanner {
      * @throws IOException If the database cannot be accessed
      */
     private void createPreSnowTask() throws IOException {
-        Task preSnowTask = new Task("Snow",
-                                    "The weather brings little snowfall. Cover your crops",
-                                    dateSevereWeather.minusDays(1L),dateSevereWeather.plusDays(1L),1L);
-        taskList.saveTask(preSnowTask);
+        List<Crop> actualCrops = cropList.getCrops();
+        for (Crop crop : actualCrops) {
+
+            Task preSnowTask = new Task("Snow",
+                    "The weather brings little snowfall. Cover your crops",
+                    dateSevereWeather, dateSevereWeather.plusDays(1L), crop.getCropId().orElse(-1L));
+
+            List<Task> actualCropTaskList = taskList.getTaskForCrop(crop.getCropId().orElse(-1L));
+            List<Task> snowTasklist = actualCropTaskList.stream().filter(task -> task.getName().equals("Snow")).toList();
+
+            List<Task> snowTaskListAtDate = new ArrayList<>();
+            for (Task task : snowTasklist) {
+                if (task.getStartDate() == preSnowTask.getStartDate()) {
+                    snowTaskListAtDate.add(task);
+                }
+            }
+            if(snowTaskListAtDate .isEmpty() && snowTasklist.isEmpty()){
+                taskList.saveTask(preSnowTask);
+            }
+
+        }
     }
 
     /**
diff --git a/src/main/java/ch/zhaw/gartenverwaltung/types/Task.java b/src/main/java/ch/zhaw/gartenverwaltung/types/Task.java
index c6eb57a..9316095 100644
--- a/src/main/java/ch/zhaw/gartenverwaltung/types/Task.java
+++ b/src/main/java/ch/zhaw/gartenverwaltung/types/Task.java
@@ -63,6 +63,7 @@ public class Task {
         this.startDate = startDate;
         nextExecution = startDate;
         this.endDate = endDate;
+        this.cropId = cropId;
     }
 
     /**
diff --git a/src/test/java/ch/zhaw/gartenverwaltung/backgroundtasks/weather/WeatherGardenTaskPlannerTest.java b/src/test/java/ch/zhaw/gartenverwaltung/backgroundtasks/weather/WeatherGardenTaskPlannerTest.java
index 8222484..34d62e7 100644
--- a/src/test/java/ch/zhaw/gartenverwaltung/backgroundtasks/weather/WeatherGardenTaskPlannerTest.java
+++ b/src/test/java/ch/zhaw/gartenverwaltung/backgroundtasks/weather/WeatherGardenTaskPlannerTest.java
@@ -52,7 +52,7 @@ public class WeatherGardenTaskPlannerTest {
         exampleTask.setNextExecution(LocalDate.now().plusDays(1L));
         exampleWeatherTask = new Task("Hail",
                 "During a summer Thunderstorm it could hail heavily. THe Hail could damage the crops. To prevent damage cover the plants with a strong tarpaulin",
-                LocalDate.now().minusDays(1L),LocalDate.now().plusDays(1L),3L);
+                LocalDate.now(),LocalDate.now().plusDays(1L),3L);
 
         taskList = new JsonTaskList(testFile);