Dormancy in temperate CP is induced by the gradually decreasing photoperiod. Plants grown in terraria and under artificial light need to be encouraged into dormancy by reducing the length of time the lights are on in stages. Plants grown in natural light (with no additional light after dark) will go dormant without any action on your part.
Temperate Droserae will form a tight knot in the center of the plant. Sarracenia will form small spikes in the plant center vs developing pitchers. VFT stops producing leaves and the traps often turn black.
Once these conditions are met, and the hibernacula are formed, the plants may go into the fridge, If you can do this in stages so much the better, but I have never lost plants if they were dormant when they went into the fridge.
The plants should be just moist, and should be placed in a ziplock bag. If fungicide is available, dust the material before placing it in the bag. I keep my temperate Drosera almost dry, just enough moisture to keep the hibernacula from withering. All lose their roots upon entering dormancy and no water uptake happens until spring.
All temperates can take occasional freezes, but avoid prolonged freezing. The critical factor is the photoperiod, not the cold. I have overwintered most of the temperates at room temps, but with a photoperiod of less than 11 hrs. Cold conditions are more optimal though, and there will be fewer losses using it.
Plants will emerge from dormancy when the daylength increases in the spring. I bring most of my plants out of dormancy in early March by placing them outside when the days are above freezing with only occasional light frosts at night.
If in the fridge, remember to occasionally check the plants for fungus, which is the main factor leading to plant loss during dormancy. If white fungus is visable, use a systemic fungicide. If not available, a light misting often discourages the fungus, but keep it very light, and check with a follow up.
Seedlings can often do without a dormancy for the first 2 years, but once they approach flowering size, the dormancy is a must, and is not optional. Plants will weaken and die without it.
Indoor gardeners should be cutting back the lights now. I reduce my lights by 15 min. every wk. starting Aug. 1st.