# ChillCast: Chill Hours Tracker — Fruit Tree Chill Hours Tracker > Fruit Tree Chill Hours Tracker (iPhone/iPad app by Akira Taniwaki.) - Source: https://appshunter.io/ios/app/chillcast-chill-hours-tracker/id6785241430 (this page in markdown: same URL + `.md`) - Developer: [Akira Taniwaki](https://appshunter.io/developer/6781045742) - Category: Weather - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 17.0 · 3 MB - Languages: American English, Japanese, European Spanish, Turkish - Released: 2026-07-05 - Data updated: 2026-09-10 - User reviews in markdown: https://appshunter.io/ios/app/chillcast-chill-hours-tracker/id6785241430/reviews.md ## What is ChillCast? ChillCast answers one question for your site: did your fruit trees and berries get enough winter chill this year? Most chill hour guides hand the work back to you. You compare several winters by hand, then hunt for the nearest weather station and hope it is close enough to your block. ChillCast does both parts for you. Give it any location and it pulls hourly temperature estimates for that point from NASA POWER, counts chill with the models growers actually use, and puts ten past winters next to this season. WHY CHILL HOURS MATTER Deciduous fruit trees and berries 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, ALL FREE - 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 and is often used in mild-winter regions. 45°F Hours and Utah units are counted Nov 1 to Feb 28 (May 1 to Aug 31 in the southern hemisphere), following UC Davis practice. Dynamic runs Sep 1 to Mar 31 (Mar 1 to Sep 30 in the south). TYPICAL CHILL FOR YOUR SITE Ten past seasons for the same point: the average, the coldest and warmest winters, and each season on its own. Outside the counting window ChillCast still answers with those numbers and last winter's result instead of an empty screen. VARIETY MATCHING Pick the trees you grow from 124 varieties across apple, peach, nectarine, cherry, pear, plum, apricot, fig, pomegranate, blueberry, grape, persimmon and quince. Every chill requirement carries the published source it came from. WORKS ANYWHERE Search by city name, use your current location, or type in coordinates. ChillCast detects the hemisphere and sets the chill season for you. FREE - All three chill models for your location - Typical chill for your site, from ten past seasons - City name search - Track up to 3 varieties in My Trees - Share card image of this season's numbers - No ads. No account. CHILLCAST PRO (one-time purchase) - This season's outlook: the projected season total, and whether each of your trees reaches its requirement - Variety fit: every included variety rated against your site's typical chill - Track every included variety in My Trees - Save and switch between multiple orchards - This season's accumulation chart and CSV export One purchase. No subscription. Ever. Weather data: NASA POWER hourly regional estimates. These are not orchard measurements. Chill requirements are representative values from public extension and nursery sources and vary by region and rootstock. NASA does not endorse ChillCast. ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | ChillCast Pro | $5.99 | one-time | ## Version history (last 4 releases) ### 1.2.0 — 2026-09-07 All three chill models (45°F Hours, Utah, Dynamic) are now free. See this location's typical chill from the past 10 winters. Pro: a season outlook that projects whether each variety will reach its chill requirement. Pro: a variety fit list rating every included variety against the typical chill here. 124 included varieties, each with a public source. Today's number now blends Apple Weather with NASA POWER, with a 10-day forecast. Share your season as a card. You can turn off anonymous usage analytics in the menu. ### 1.1.0 — 2026-08-19 - Choose your own varieties in My Trees (3 free, all 20 with Pro) - Weather data now comes from NASA POWER, with the source and data date shown in the app - Improved data-quality checks and season-boundary accuracy - Added Spanish and Turkish localization ### 1.0.1 — 2026-07-11 - 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 ### 1.0 — 2026-07-05 No release notes. ## More apps by Akira Taniwaki - [Leafmark: EPUB Reader & Notes](https://appshunter.io/ios/app/leafmark-epub-reader-and-notes/id6781045740) - [Sports Photographer Helper](https://appshunter.io/ios/app/sports-photographer-helper/id6781572518) - [Match Notebook: Rival Scout](https://appshunter.io/ios/app/match-notebook-rival-scout/id6781687173) - [Dotto - Simple Todo List](https://appshunter.io/ios/app/dotto-simple-todo-list/id6782310741) - [PlanOnce](https://appshunter.io/ios/app/planonce/id6782772002) All apps by Akira Taniwaki: https://appshunter.io/developer/6781045742 --- *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 2026-09-10.*