Calculate chill automatically
Use regional temperature estimates for your current or selected location to track this season.
A chill-hours tracker for fruit growers
Will your trees fruit
this year?
ChillCast turns NASA POWER regional temperature estimates into this season’s accumulated chill, then shows whether your own trees have had enough.
See dormancy as a number
Read the season with three chill models, not one guess.
Compare three models
Put 45°F Hours, Utah, and Dynamic side by side for a better climate fit.
Track your own trees
Choose apples, peaches, grapes, and more in My Trees and see what is still short.
Inside the app
A closer look at ChillCast in use.
Free + Pro one-time purchase
Check this season free.
Pro is a one-time $9.99.
Free includes 45°F Hours and up to three varieties in My Trees. Pro unlocks all three models, all 20 included varieties, multiple locations, history, and CSV export. Local App Store pricing may vary.
- Transparent NASA POWER attribution
- Northern and Southern Hemispheres
- One purchase with no auto-renewal
ChillCast