De Natuurkalender
Latest observations
- [vertalen: eikzomer] · .. 25-Sep-2026
- Small copper · First in.. 23-Sep-2026
- Holly Blue · First indi.. 23-Sep-2026
- Hedgehog · First indivi.. 21-Sep-2026
- Land slugs · Many 21-Sep-2026
- [vertalen: paardekastanjewitte.. 15-Sep-2026
- Wasp · First individual 15-Sep-2026
Updates
- Autumn colouring in the Netherlands is late; European autumn campaign with students 11-Oct-2021
- The 2017 growing season of a Dutch birch captured by the GrowApp 10-Dec-2017
- Capture the green explosion in your surroundings with the GrowApp; now also available on iOS 01-Apr-2017
- GrowApp: make an animation of climate change in your backyard 20-Mar-2017
Extra attention
Hazel
Record your first flowering of hazel: Anonymus or With account
Click here for the species of which we would like you to record your sightings.
Observations per week
Map
Jan
Dec
First flower
The Dutch phenological network with observations of yearly recurring life cycle events in nature since 1868.
The new website has been made possible by the Prins Bernhard Cultuurfonds and Wageningen University.