GDDTracker

GDDTracker

Growing Degree Day Calculator

12 ratings
6 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • March 15, 2026
  • August 25, 2026

Features

GDDTracker screenshot #1 for iPhone
GDDTracker screenshot #2 for iPhone
GDDTracker screenshot #3 for iPhone
GDDTracker screenshot #4 for iPhone
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About

This app calculates Growing Degree Days (GDD) using hyper-local weather data to help you precisely time lawn care applications. It also logs applications, provides smart reminders, and includes profiles for over 50 grass varieties.

Growing Degree Day (GDD) calculation and forecasting
Application logging with product details and notes
Smart reminders based on GDD, days, or soil temp
50+ grass variety profiles
Rate calculator for product amounts
Multiple lawn management
CSV/PDF record export
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What's New in GDDTracker

2.4

August 25, 2026

New in Version 2.4! Plan your whole season, right in the app. • Plan Ahead: Schedule what you intend to do — seed, fertilizer, pre-emergent, PGR — without logging it as done. Everything shows in My Plan and reminds you on its target date. • Multiple tasks per day: Have three things to do on the same day? Each now shows as its own item so nothing gets missed. • Quick actions: Mark Done or Snooze right from the notification, and edit any scheduled task's date or details anytime. • Widget: Your next planned task now appears on the home-screen widget. • Save your products: Add your own products once and reuse them from the picker — no more retyping. Manage them in Settings. • New PGR: Added Atticus ProMaxis. Plus a cleaner 7-day forecast and bug fixes for a smoother experience. Thanks for all the feature requests — keep them coming!

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Subscription plans

Monthly

Monthly Subscription

$0.991 Month
How to cancel GDDTracker subscription ⁉️

User reviews

The piping lawn man

The delicacies of Lawn enrichment, ensure that the pleasures of those gazing upon thy plethora of enhanced green grass encourage not only focus and determination of the mind but attention to fine grain logistical growing skills. Thus, I have downloaded this extravagant app in the pursuit of the greatest possible growth of my yard. Those who dabble around my house with glee have found that post use of this app, has not only saved our family from the despicable sight of the growing grass during the summer months, but has almost turned my yard into a professional experience of frolicking insects in this film set version of my yard. The experience is not only sublime, it’s calming to use like a warm winters month smoking pipe weed and reading the adventures of Tolkien. I implore you, and hope that you follow me along this journey of discovery, and download this app. You shall not go wrong in this perfection. Thank you to the creator of this app, for you have joined together those of us who have tasteful dedication, to the righteous gaze from those passerby’s who glorify our yards.
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My grass is so juicy

OMG!!! My grass is so green and Lucious. Just learned that word today! Love how this app tracks my grass. YIPEEEEE!

AMAZING

Honest review, I’ve tried other apps that are suppose to do what this app does and they don’t work nearly as good as this one!

Response from developer

Thank you so much! I am glad to finally provide a much needed app to the lawn care community. Please send us an email if there are any features you think would be useful!

Love this!

Awesome tool for a new home owner who wants a beautiful lawn.

Just what we needed

Great app!

FAQ

What is GDDTracker used for?

GDDTracker is used to calculate Growing Degree Days (GDD) based on your location and hyper-local weather data. This helps you precisely time lawn care applications like pre-emergents, fertilizers, and more.

How does GDDTracker calculate GDD?

GDDTracker calculates GDD using your location to fetch daily temperature data. It then applies a chosen formula to determine the accumulated degree days, helping you forecast when to reach specific thresholds.

Can GDDTracker help me remember when to reapply treatments?

Yes, GDDTracker offers smart reminders. You can set notifications based on GDD accumulation, calendar days, or soil temperature, and receive early warning alerts as you approach your application thresholds.

What kind of lawn care information can I log in GDDTracker?

You can log every application, including PGRs, fertilizers, weed control, fungicides, and insecticides. The app allows you to track products used, application rates, and add specific notes for each entry.

Does GDDTracker support multiple lawns?

Yes, GDDTracker is built to manage multiple lawns. You can set up separate locations, customize settings, and use color tags for each lawn, making it ideal for professionals or those with diverse properties.

What are the subscription options for GDDTracker Pro?

GDDTracker Pro offers two auto-renewing subscription options: a monthly plan for $0.99/month and an annual plan for $9.99/year. The annual plan includes a 7-day free trial.

How do I cancel my GDDTracker subscription?

You can manage and cancel your subscriptions by going to your App Store account settings after purchase. Subscriptions must be canceled at least 24 hours before the end of the current period to avoid renewal.

Is GDDTracker available on Apple Watch?

Yes, GDDTracker has an Apple Watch app, allowing you to get a quick glance at your lawn care information directly from your wrist.