...by car:

From the North:
Motorway A7 direction Hannover until exit Mellendorf, next towards A352 until exit Langenhagen Pferdemarkt, follow the signs "Rennbahn".

From the East:
Motorway A2 direction Hannover until exit Bothfeld, next follow the Bothfelder Straße towards Langenhagen until Theodor-Heuss-Straße, follow the signs "Rennbahn".

From the West:
Motorway A2 towards Hannover Langenhagen exit, stay on Walsroder Straße until junction Reuterdamm, on the Reuterdamm drive towards the Theodor-Heuss-Straße, then follow the signs for "Rennbahn".

From the South:
Motorway A7 towards Hannover until exit Kirchhorst, stay on Motorway A37 until exit Hannover-Buchholz, then use the Motorway A2 until exit Bothfeld, next follow the Bothfelder Straße towards Langenhagen until Theodor-Heuss-Straße, follow the signs "Rennbahn".

...using Public Transportation

The ICE and IC connections take you around the clock from all directions to Hanover main station.

Your connections:
1) Use Tram-line 1 in only 15 Minuten until "Langenhagen Zentrum".
1a) From here there is a bus line (122) towards Langenhagem Grenzheide - 10 minutes walk.
1b) Or take the bus line (650) towards Großburgwedel until stop "Pferderennbahn".

Alternative connection:
1) Take the train (S-BAHN line 4/5) until stop "Pferdemarkt". Then take a 5 minutes walk to "Langenhagen Bahnhofstraße".
1a) From here there is a bus line (122) towards Langenhagem Grenzheide - 10 minutes walk.