Harvest Window

Agriculture Math & Calculations Credits / request: 1

Accumulates crop GDD against the harvest threshold and estimates the harvest date. Not a prescription.

POST https://api.apikodu.com/api/v1/agriculture/harvestwindow

Documentation

Overview

Accumulates crop GDD to the harvest (or stageCode) threshold. Not a prescription.

Authentication

Every request requires the x-api-key header. Credits used and remaining quota are returned in response headers (x-api-credits-used, x-api-remaining-credits, x-rate-limit-*).

Request

POST https://api.apikodu.com/api/v1/agriculture/harvestwindow

JSON body. GET query also exists. dailyTemps or lat/lon.

Parameters

Name	Type	Required	Default	Options	Description
`crop`	string	* Required	`wheat`	`wheat` `barley` `maize` `sunflower` `cotton` `potato` `tomato` `rapeseed` `oats` `rye` `sugarbeet` `grape` `apple` `chickpea` `lentil`	Crop code.
`fromDate`	string	* Required	—	—	YYYY-MM-DD
`toDate`	string	Optional	—	—	YYYY-MM-DD. Empty uses fromDate+365.
`latitude`	number	Optional	—	—	Required without dailyTemps.
`longitude`	number	Optional	—	—	Longitude.
`stageCode`	string	Optional	`harvest`	`emergence` `flowering` `harvest`	GDD threshold code. Default harvest.
`includeDaily`	boolean	Optional	`true`	`true` `false`	Daily GDD. Default true.
`dailyTemps`	json	Optional	—	—	[{date,tmin,tmax}]. Overrides lat/lon.

Response

Name	Type	Description
`crop`	string	Normalized crop.
`stageCode`	string	Threshold code used.
`threshold`	number	Required cumulative GDD.
`gddCumulative`	number	Accumulated GDD.
`reached`	boolean	true when the threshold is reached.
`reachedDate`	string	Day the threshold was crossed. Null if not.
`remainingGdd`	number	Remaining GDD. 0 when reached.
`estimatedDate`	string	Estimate from mean daily GDD. Null without data.
`fromDate`	string	YYYY-MM-DD.
`toDate`	string	YYYY-MM-DD.
`daysTotal`	integer	Calendar days in the window.
`daysWithData`	integer	Days used for GDD.
`missingCount`	integer	Missing day count.
`missingDates`	array	First 10 missing dates.
`gridLatitude`	number	0.1° cell.
`gridLongitude`	number	0.1° cell.
`stages`	array	Crop GDD thresholds.
`stages[].code`	string	emergence, flowering, harvest ...
`stages[].threshold`	number	Threshold GDD.
`stages[].reached`	boolean	Whether reached.
`daily`	array	When includeDaily=true.
`daily[].date`	string	YYYY-MM-DD.
`daily[].tmin`	number	Min °C.
`daily[].tmax`	number	Max °C.
`daily[].gdd`	number	Daily GDD.
`daily[].gddCumulative`	number	Cumulative.
`method`	string	gdd-harvest.
`source`	string	database or user.
`disclaimer`	string	Decision-support disclaimer.

Errors

HTTP	code	Description
`400`	`-250`	crop missing or unknown.
`400`	`-249`	stageCode not on this crop or body empty.
`400`	`-254`	Invalid date range.
`400`	`-255`	dailyTemps or lat/lon required.
`429`	`-316`	Daily new location (cell) limit (50) reached. Previously requested locations keep working; new locations next day (UTC). Retry-After header gives seconds until end of day.
`503`	`-256`	Cell is filling.
`400`	`-251`	No weather.
`401`	`-100`	x-api-key is missing, empty, malformed, inactive, banned, expired, IP-restricted, or not allowed for this API.
`429`	`-221`	Per-minute request limit exceeded. Response headers: x-rate-limit-limit, x-rate-limit-remaining, x-rate-limit-reset.
`429`	—	Package credit quota cannot cover this request. Body may be { error, limit, currentUsage, requestCost } (no code field).
`500`	`-1`	Unexpected server error. message is a generic error text without technical details.

Notes

Success body is { data: { ... } }. Error body is { code, message }. code is an ApiResponseCode enum value (negative integer).

Sample response

{
  "data": {
    "crop": "wheat",
    "stageCode": "harvest",
    "threshold": 1600.0,
    "gddCumulative": 1624.5,
    "reached": true,
    "reachedDate": "2026-07-18",
    "remainingGdd": 0.0,
    "estimatedDate": "2026-07-18",
    "fromDate": "2026-03-01",
    "toDate": "2026-08-31",
    "daysTotal": 184,
    "daysWithData": 180,
    "missingCount": 4,
    "missingDates": [
      "2026-03-12"
    ],
    "gridLatitude": 39.90,
    "gridLongitude": 32.90,
    "stages": [
      {
        "code": "emergence",
        "threshold": 120.0,
        "reached": true
      },
      {
        "code": "flowering",
        "threshold": 800.0,
        "reached": true
      },
      {
        "code": "harvest",
        "threshold": 1600.0,
        "reached": true
      }
    ],
    "daily": [
      {
        "date": "2026-03-01",
        "tmin": 2.0,
        "tmax": 12.0,
        "gdd": 3.0,
        "gddCumulative": 3.0
      }
    ],
    "method": "gdd-harvest",
    "source": "database",
    "disclaimer": "Decision support only. Not agronomic advice. Weather data: Copernicus ERA5 / ERA5-Land, Open-Meteo, OpenWeather, MET Norway. Contains modified Copernicus Climate Change Service information."
  }
}

Code samples

  
      const response = await fetch('https://api.apikodu.com/api/v1/agriculture/harvestwindow', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'x-api-key': 'YOUR_API_KEY'
        },
        body: JSON.stringify({
          name: 'example',
          value: 123
        })
      });

      const data = await response.json();
      console.log(data);

  
      import requests

      headers = {
          'Content-Type': 'application/json',
          'x-api-key': 'YOUR_API_KEY'
      }

      payload = {
          'name': 'example',
          'value': 123
      }

      response = requests.post('https://api.apikodu.com/api/v1/agriculture/harvestwindow', headers=headers, json=payload)
      data = response.json()
      print(data)

  
      using var client = new HttpClient();
      client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");

      var payload = new { name = "example", value = 123 };
      var json = JsonSerializer.Serialize(payload);
      var content = new StringContent(json, Encoding.UTF8, "application/json");

      var response = await client.PostAsync("https://api.apikodu.com/api/v1/agriculture/harvestwindow", content);
      response.EnsureSuccessStatusCode();

      var data = await response.Content.ReadAsStringAsync();
      Console.WriteLine(data);

 
     $data = [
         'name' => 'example',
         'value' => 123
     ];

     $response = file_get_contents('https://api.apikodu.com/api/v1/agriculture/harvestwindow', false, stream_context_create([
         'http' => [
             'header' => "x-api-key: YOUR_API_KEY"
         ],
         'method'  => 'POST',"
         'content' => json_encode($data)
      ]));

      print_r(json_decode($response, true));

  
      curl -X POST 'https://api.apikodu.com/api/v1/agriculture/harvestwindow' \
        -H 'Content-Type: application/json' \
        -H 'x-api-key: YOUR_API_KEY' \
        -d '{
          "name": "example",
          "value": 123
        }'

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