Many Tasmanian farmers in the north and north west of the state say the sustained period of rain is the worst they've seen in memory.

Higher than normal rain has fallen in the north of the state over the past couple of months causing wet and soggy conditions which are now affecting farming operations.

Poppy farmers have been able to sow only half the normal crop because of wet paddocks and other growers like pea and pyrethrum growers are also experiencing delays with putting their crops in.

The heavy rains have also caused erosion on many properties and has affected stock who haven't been able to graze in the muddy paddocks.

Dairy Farmer Paul Bennett has been farming for around 30 years and says it's hard work at the moment trying to find paddocks that the cows won't bog, and cause pasture damage.

Glen Connors is trying to put poppies and onions in at his Barrington property but says he can't get near the paddocks to even think about sowing any crops.

The weather bureau says the rain is expected to ease after today and some sunshine is forecast for the next few days, a welcome relief to farmers in Tasmania not used to complaining about too much rain.