About BloomWatch
Canada's Bloom Forecast Platform
Our Mission
BloomWatch is building Canada's definitive bloom forecasting platform. We started with cherry blossoms because they're one of the most anticipated — and most unpredictable — natural events of the Canadian spring.
Our mission is to make bloom season accessible, predictable, and delightful for every Canadian. BloomWatch is to cherry blossoms what The Weather Network is to weather — the definitive Canadian source, built as public-benefit infrastructure.
How We're Different
Data-driven forecasts, not guesswork
We use Growing Degree Day models calibrated with 30+ years of Environment Canada weather data. Every forecast is backed by peer-reviewed phenology science.
Pan-Canadian coverage
The only platform tracking blooms across all major Canadian cities — from Victoria to Edmonton, from Niagara to Montréal.
Open and transparent
Our methodology is documented, our data sources are credited, and we're building toward open data. No black boxes.
How Our Forecasts Work
Growing Degree Day Model
Starting January 1, we track the accumulation of heat each day. When average daily temperatures exceed 5°C — the base temperature at which cherry blossom development begins — that excess heat is counted as “degree days.” Cherry trees typically reach peak bloom when they accumulate enough GDD, and we calibrate this threshold per city and cultivar type.
Chill Hour Requirements
Cherry trees also need a cold winter to bloom — called vernalization. They must accumulate sufficient hours below 7°C before their spring growth can begin. We track this to identify years where warm winters might affect bloom timing.
Forecast Accuracy
Validated against 30+ years of High Park bloom records and Vancouver Cherry Blossom Festival data, our model achieves ±3 day accuracy for peak bloom onset under normal weather conditions.
Data Sources & Credits
Environment and Climate Change Canada
Historical and real-time weather data
Vancouver Cherry Blossom Festival
Tree location data, cultivar information, bloom records
High Park Nature Centre
Toronto bloom records (longest urban cherry blossom dataset in Canada)
PlantWatch Canada / NatureWatch
Citizen phenology observations
George Mason University Cherry Blossom Prediction Competition
Forecast methodology reference
The Team
Rushabh Sanghvi — Founder
BloomWatch was founded by Rushabh Sanghvi, a technologist based in Waterloo, Ontario, who believes Canada deserves world-class nature tracking tools. We're actively seeking partnerships with municipal parks departments, botanical gardens, tourism boards, and citizen science organizations.
Want to partner with BloomWatch? hello@bloomwatch.ca
Future Vision
Cherry blossoms are just the beginning. BloomWatch will expand to track tulips, lilacs, fall foliage, and wildflower seasons — building the most comprehensive seasonal nature platform in Canada. Our goal is to create the data infrastructure that helps every Canadian connect with the natural rhythms of this extraordinary country.
Join the BloomWatch Community
Free alerts before peak bloom arrives in your city.