ChillCast

Fruit Tree Chill Hours Tracker

Free · In-App Purchases · Designed for iPad. Not verified for macOS.

Know if your fruit trees got enough winter chill. Real weather data, three scientific models, 20 varieties. Free, no ads. ChillCast tells you whether your fruit trees received enough winter chill to fruit this year. It pulls real hourly temperatures for your location from Open-Meteo (ERA5 reanalysis) and accumulates chill using the models growers actually use. No guessing, no manual logging. WHY CHILL HOURS MATTER Deciduous fruit trees need a minimum amount of winter cold to break dormancy and bloom evenly. Too little chill means delayed, scattered bloom and a poor crop. ChillCast shows where you stand right now. THREE CHILL MODELS - 45°F Hours (Weinberger): counts hours between 0-7.2°C. The traditional standard for cold climates. - Utah (Richardson): weights temperature bands, and warm spells subtract from your total. - Dynamic / Chill Portions (Fishman-Erez): handles warm reversals dynamically. Widely considered the most accurate model for mild climates. VARIETY MATCHING 20 varieties across apple, peach, cherry, pear, plum, apricot, fig, pomegranate, blueberry, and grape. See at a glance which have met their chill requirement and which are falling short, and by how many hours. WORKS ANYWHERE Automatic hemisphere detection sets the chill season for you: September to March in the north, March to September in the south. Use your current location or type in coordinates. FREE - 45°F Hours accumulation for your location - Chill requirement matching for 3 varieties - No ads. No account. No tracking. CHILLCAST PRO (one-time purchase) - Unlock all three chill models side by side - All 20 varieties - Save and switch between multiple orchards - Season history chart - CSV export of daily accumulation - Notifications when a variety meets its requirement, and a warm-winter alert late in the season when it will not One purchase. No subscription. Ever. Weather data by Open-Meteo (ERA5). Chill requirements are representative values from public extension sources and vary by region and rootstock.

Ratings & Reviews

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- Your orchard location is now remembered between launches - New warm-winter alert: get notified late in the season when a variety is unlikely to meet its chill requirement (Pro) - Tap anywhere on a locked model row to view Pro options - Faster season history screen and smaller fixes

Version 1.0.1

The developer, Akira Taniwaki, 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

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    Information

    Provider
    • Akira Taniwaki
    Size
    • 693.2 KB
    Category
    • Weather
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 3 more
    • English, Japanese, Spanish, Turkish
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Akira Taniwaki
  • Privacy Policy

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