It occurs in the western Palearctic but its true status in some areas is muddled due to issues of taxonomy and misidentification.

This reddish colour on the basal sternites is similar to A. bimaculata but A. trimmerana is larger and is rougher on the top of the propodeum.

[3] Andrena timmerana is a generalist which occurs across many habitats including landslips and cliffs in coastal areas and heaths, open woodland, chalk grassland, fens, pastures and gardens in inland areas,[3] as well as brownfield sites and occasionally urban greenspace.

[1] Andrena timmerania has two generations each year, i.e. it is bivoltine, one in the Spring which flies from mid March to the end of April and the other in the summer from July to late September.

It is polylectic and has been recorded foraging on buttercups, willows, bramble, rhododendron, blackthorn, gorse, alexanders and dandelion.