Our exceptionally bitter winter seemed to have put spring on standby this year, as key signs of seasonal change lagged weeks behind.
Until very recently snowdrops still graced many of our parks, gardens and woods while the lack of spring flowers was startling.
Nature's Calendar, where people can record sightings of seasonal change and see the latest stats, has shown we are several weeks behind recent years.
For example, we would expect around 1,000 sightings of hawthorn budburst by mid-March but this year had only 14.
We would also have expected around 1,000 sightings of blackthorn flowering, but by mid-March there had been just one.
In the last couple of weeks the number of sightings has finally picked up as temperatures have increased.
But this has been an exceptional season - December was the coldest for 15 years, January the coldest for 13 years and February the coldest for 19 years.
Yet spring, on average, is actually arriving earlier than it used to 30 or 40 years ago.
So how do different species cope with this seasonal shift? This is where we need your help.
“Simply by letting us know when and where you spotted your first leafing tree, ladybird or frogspawn of the year, we can begin to understand the impact of climate change on our native species,” said Nature's Calendar manager Dr Kate Lewthwaite.