Planting out tomato plants

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I have a few tomato plants in the house which i started from seed in early March. Plants are now 30cm high. I intend to plant out in polytunnel. Have been tempted to plant out recently with all the warm weather we're having, but also weary about a late frost in May! Night time temp for this region, north UK, showing 4-6 degrees for some nights later this week.
Is it still risky to plant out?
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Hi, no heating at all in polytunnel. Think i will plant them out at end of this week if night time temperatures are getting around 8-10 degrees. Last year i remember delaying planting until 3rd week in May as there were quite sharp frost earlier in the month.
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