# Growing Degree Days Tracker — GDD & Bloom Timing (GTS)

> Temperature sum tracker for seasonal development and bloom timing. (iPhone/iPad app by Bernhard Hering.)

- Source: https://appshunter.io/ios/app/growing-degree-days-tracker/id6742846678 (this page in markdown: same URL + `.md`)
- Developer: [Bernhard Hering](https://appshunter.io/developer/327542085)
- Category: Weather, Reference
- Price: Free with in-app purchases (on sale, was $2.99)
- Rating: 3.00/5 from 1 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.0 · 3 MB
- Languages: French (France), German (Germany), American English, European Spanish, Italian
- Released: 2025-03-06
- Data updated: 2026-08-25
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/growing-degree-days-tracker/id6742846678/reviews.md

## What is Growing Degree Days Tracker?

Grassland Temperature Sum App – GTS & GDD Bloom Tracker

The Grassland Temperature Sum (GTS) is a temperature-based indicator used to track seasonal development and blooming phases.
It follows the same principle as Growing Degree Days (GDD), widely used in the US, and is especially well suited for early spring phenology.

This app helps farmers, gardeners, beekeepers, and homesteaders understand when nature actually starts — based on accumulated heat, not calendar dates.

With Grassland Temperature Sum, you can monitor temperature sums, track blooming progress, and compare seasonal development across multiple locations.

Key Features

• Automatic Location Detection
Uses your location and regional weather data for accurate calculations.

• Daily Updated Temperature Sums (GTS / GDD-based)
Daily mean temperatures are accumulated from the beginning of the year.
GTS is optimized for phenological development; GDD follows the standard growing degree day concept.

• Bloom Calendar with Progress Indicator
See which plants are currently blooming, about to bloom, or not yet active — ideal for tracking forage and nectar availability.

• Monitor Multiple Locations
• 1 location free
• Up to 3 locations with annual subscription
• Up to 10 locations with extended subscription
Perfect for farms, apiaries, gardens, and homesteads.

Why Temperature Sums Matter

Temperature sums like GTS and GDD help assess how far the season has progressed:
• Early, cold years develop slowly
• Mild winters and warm springs advance bloom timing
• Bloom and forage availability depend on accumulated heat, not dates

Who Is This App For?

• Farmers – Plan fertilization and field work based on temperature sums
• Gardeners & Homesteaders – Time planting and seasonal tasks more reliably
• Beekeepers – Track bloom timing of important nectar and pollen plants
• Researchers & Consultants – Use temperature-based indicators for analysis

Grassland Temperature Sum gives you a clear, location-based view of seasonal development — using GTS and GDD principles to help you make better timing decisions.

Terms and conditions:
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Key features

- Automatic location detection
- Daily updated temperature sums (GTS/GDD)
- Bloom calendar with progress indicator
- Monitor multiple locations
- Location-based seasonal development view

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| bis zu drei Standorte | $3.99 | per year |
| Bis zu zehn Standorte | $12.99 | per year |


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/growing-degree-days-tracker/id6742846678/reviews.md

### 1/5 — Ungenau

*2026-07-26*

Leider ist die App und Erläuterungen sehr ungenau, vom Support erhält man keine Antwort

**Developer response:** Hallo Andre, danke für dein Feedback. Wir haben unser Supportpostfach geprüft, konnten jedoch keine Nachricht von dir beziehungsweise zu dieser Bewertung finden. Bitte melde dich noch einmal über das Briefumschlag-Symbol in der App oder direkt unter info@bernhardhering.de und beschreibe uns kurz, welche Angaben ungenau sind. Wir schauen uns das dann gerne konkret an und antworten dir schnellstmöglich.

### 5/5 — Top App

*2026-06-28*

Die App ist perfekt und gerade für mich als Anfänger sehr hilfreich

### 1/5 — Nicht zu empfehlen

*2026-03-17*

Man soll ein Abo abschließen für mehrere Standorte die man aber nicht mehr anpassen kann. Sollte das jemals geändert werden wäre ich bereit die App zu nutzen. Ansonsten nur abzocke!

**Developer response:** Vielen Dank für dein Feedback!

Die Standort-Beschränkung ist technisch leider notwendig, da wir für jeden Standort Wetter- und Umweltdaten von externen Anbietern beziehen müssen – diese Daten sind für uns mit laufenden Kosten verbunden. Deshalb können wir nicht unbegrenzt viele Standorte kostenlos anbieten.

Grundsätzlich wäre es technisch möglich, diese Einschränkung zu umgehen – das würde aber bedeuten, dass wir die entstehenden Kosten selbst tragen müssten, was langfristig nicht tragfähig ist.

Wir verstehen aber absolut deinen Punkt bezüglich der fehlenden Anpassbarkeit. Das ist ein berechtigter Hinweis, und wir prüfen bereits, wie wir hier in Zukunft flexiblere Lösungen anbieten können.

Danke, dass du dir die Zeit für dein Feedback genommen hast 🙏

## Frequently asked questions about Growing Degree Days Tracker

### What is Growing Degree Days Tracker?

Growing Degree Days Tracker is a weather app that uses temperature sums (GTS and GDD) to help you track seasonal development and bloom timing. It's designed for farmers, gardeners, and beekeepers to better understand when nature starts based on accumulated heat.

### How does Growing Degree Days Tracker calculate temperature sums?

The app automatically detects your location and uses regional weather data to accumulate daily mean temperatures from the beginning of the year. It offers both GTS, optimized for phenological development, and GDD, following the standard growing degree day concept.

### Can I monitor multiple locations with Growing Degree Days Tracker?

Yes, you can monitor multiple locations. The free version allows for 1 location, an annual subscription offers up to 3 locations for $3.99/P1Y, and an extended subscription provides up to 10 locations for $12.99/P1Y.

### What kind of plants can I track with Growing Degree Days Tracker?

The app's Bloom Calendar with Progress Indicator helps you see which plants are currently blooming, about to bloom, or not yet active. This is ideal for tracking forage and nectar availability, which is crucial for beekeepers and farmers.

### Is Growing Degree Days Tracker suitable for research purposes?

Yes, researchers and consultants can use Growing Degree Days Tracker. The temperature-based indicators like GTS and GDD provide valuable data for analysis and understanding seasonal progression.

### What devices does Growing Degree Days Tracker support?

Growing Degree Days Tracker is available for watch, iPhone, and iPad, offering flexibility for users to monitor their data across different Apple devices.

### How often is Growing Degree Days Tracker updated?

The app was last updated on 2026-03-10, indicating ongoing development and support. The latest version available is 1.18.

### What is the age rating for Growing Degree Days Tracker?

Growing Degree Days Tracker has an age rating of 4+, making it suitable for a wide range of users, including younger individuals interested in nature and agriculture.

## Version history (last 5 releases)

### 1.18 — 2026-03-10

Change: Flowering phases are now sorted chronologically by their GTS start value.

### 1.17 — 2026-03-07

Fix: The phenological wheel now shows the yearly progression in the inner ring and the red pointer correctly again.

### 1.16 — 2026-03-04

New: More consistent unit display for US locale (Fahrenheit instead of Celsius in affected views).
Fix: Adjusted elderflower and black locust bloom thresholds to avoid overly early bloom indicators.
Fix: The previous update had a bug where saved locations were temporarily missing for some existing users. This update restores those locations.

### 1.15 — 2026-03-03

New: More consistent unit display for US locale (Fahrenheit instead of Celsius in affected views).
Fix: Adjusted elderflower and black locust bloom thresholds to avoid overly early bloom indicators.

### 1.14 — 2026-03-02

New: More consistent unit display for US locale (Fahrenheit instead of Celsius in affected views).
Fix: Adjusted elderflower and black locust bloom thresholds to avoid overly early bloom indicators.

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All apps by Bernhard Hering: https://appshunter.io/developer/327542085

## Related topics

[growing degree days tracker](https://appshunter.io/ios/topics/growing-degree-days-tracker)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*