Turf Tempo: GDD Tracker
PGR timing for turf & lawn
Only for iPhone
$1.99 · Designed for iPhone. Not verified for macOS.
iPhone
Turf Tempo tells you when to reapply plant growth regulators (PGRs) — timed to the plant, not the calendar.
PGRs like trinexapac-ethyl, prohexadione-calcium, and paclobutrazol wear off on a schedule set by temperature, not by days. Turf Tempo tracks Growing Degree Days (GDD) from your local weather and shows you when suppression is fading — so you reapply on time, avoid rebound, and keep clippings and seedheads in check.
WHAT MAKES IT DIFFERENT
Most tools hand you a single number. Turf Tempo is honest about the science behind it:
• Targets adjust to your product, mowing height, season, and grass.
• Every target shows a confidence level — validated research vs. an educated starting point.
• At lawn height, where the research runs out, it starts conservative and dials the interval in to your turf as you log how it responds.
FEATURES
• GDD tracking from real local weather, per property
• Next-application forecast and a live progress gauge
• 7-day Spray Outlook: rain, wind, and heat suitability at a glance
• On-label awareness — products that aren't labeled for your site are flagged, with the reason
• Product, rate, and application history
• Optional cloud backup (email sign-in, no password)
• Reminders as you approach or pass your target
• A built-in guide that explains the model and cites its sources
WHO IT'S FOR
Sports-turf and lawn-care pros, and serious DIY lawn enthusiasts running a PGR program on greens, fairways, or home lawns.
Everything works on your device; an account is optional and only for backup.
Turf Tempo is a scheduling aid, not a substitute for the product label or professional agronomic judgment. Always read and follow the product label.
Questions or feedback? turftempo@gmail.com
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
This update refines the reapplication-interval controls and smooths out a few rough edges from the 2.0 launch.
• Finer interval tuning — the manual Shorten / Lengthen adjustment now moves in gentle, consistent 5% steps. Tap more than once to keep adjusting, and going down then back up always lands on the same number.
• More accurate dial-in — when you mark growth returning, your interval is now set closer to what you actually observed on your turf.
• Clearer property setup — choosing your grass species is now its own labeled step, and the screen scrolls to bring it into view so it's easy to find.
• Cleaner Spray Outlook card — simpler, more readable wording on the weekly forecast.
Thanks for using Turf Tempo!
The developer, Ryan Gault, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Ryan Gault
- Size
- 31.3 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Ryan Gault

