Alpine Spring Arrives Six Days Earlier Than 25 Years Ago

Swiss study reveals significant climate impact on Alpine flora, with warming temperatures advancing spring growth by nearly a week.

Spring growth in the Swiss Alps now begins significantly earlier than it did two decades ago.
The study utilized 40 IMIS weather stations located between 1,700 and 2,700 meters altitude.
Plants relying on temperature cues may displace those relying on day length (photoperiod).

6 days

earlier onset of spring growth

2 degrees Celsius

temperature increase

1,700-2,700 metres

altitude range

"Climate change is reshaping the ecosystem in the mountains."
— Michael Zehnder

"The internal clock causes some to only sprout when the days have reached a certain length. Others need warmth above all."
— Michael Zehnder

Accelerating the Alpine Clock

Spring growth in the Swiss Alps now begins significantly earlier than it did two decades ago.
The study utilized 40 IMIS weather stations located between 1,700 and 2,700 meters altitude.
Plants relying on temperature cues may displace those relying on day length (photoperiod).