Apparatuses and methods for indicating when a container has reached a predefined temperature are disclosed. An activatable temperature indicator can include a first indicator portion with a first material with a melting point, and a second indicator portion with a second material configured to change color when combined with the first material of the first indicator portion when the first material reaches the melting point. A separation member can be removeably positioned between the first indicator portion and the second indicator portion, and a biasing mechanism can be configured to bias the first indicator portion and the second indicator portion into contact when the separation member is removed. An attachment mechanism can also be used to place the first indicator portion and the second indicator portion into contact.