Calendari orto
Garden calendar for Viterbo: what to sow and transplant month by month Local vegetable-garden calendar for Viterbo.
Editions EN English IT Italian Garden calendar for Viterbo For Viterbo, this calendar shows when to sow, transplant, and protect the garden, based on local frost, heat, dry spells, and crop windows.
How to read the year In Viterbo, the garden year is best read from the cautious last-frost date: after April 9, windows become more suitable for sensitive crops.
The strongest part of the calendar falls in June, July, August: these are the months with the most recommended direct-sowing and transplant windows.
Toward autumn, the cautious first frost is around November 6. The main year-level check is: dry-spell risk: plan irrigation, heat risk for sensitive crops.
Municipality climate summary Municipality Viterbo Province Viterbo (VT) Region Lazio Median last frost 0C March 18 Cautious last frost 2C April 9 First autumn frost 2C November 6 Average days above 30C 50.4 days Average longest summer dry spell 20.37 days Seasonal guidance Late winter / early spring Direct sowing
Transplants
Watch for: dry-spell risk: plan irrigationFull spring Direct sowing
Swiss chard Carrot Tuscan kale +13 more Transplants
Broccoli Tuscan kale Onion +11 more Watch for: overall climate risk is moderateSummer Direct sowing
Swiss chard Carrot Tuscan kale +13 more Transplants
Broccoli Tuscan kale Cucumber +11 more Watch for: heat risk for sensitive crops, dry-spell risk: plan irrigationAutumn Direct sowing
Garlic Swiss chard Carrot +11 more Transplants
Broccoli Tuscan kale Cucumber +7 more Watch for: overall climate risk is moderateMonthly calendar tmin 2.31 C tmax 9.9 C rain 53.17 mm dry 12.77 days Direct sowing: -Start indoors: -Transplants: -tmin 2.33 C tmax 10.97 C rain 57.45 mm dry 10.3 days Direct sowing: -Start indoors: Broccoli, Tuscan kaleTransplants: -tmin 4.59 C tmax 14.41 C rain 58.35 mm dry 14.13 days Direct sowing: OnionStart indoors: Broccoli, Tuscan kale, Fennel, +4 moreTransplants: Oniontmin 7.4 C tmax 17.84 C rain 56.32 mm dry 9.87 days Direct sowing: Swiss chard, Carrot, Tuscan kale, +9 moreStart indoors: Broccoli, Tuscan kale, Fennel, +7 moreTransplants: Broccoli, Tuscan kale, Onion, +4 moretmin 11.37 C tmax 22.47 C rain 52.75 mm dry 11.17 days Direct sowing: Swiss chard, Carrot, Tuscan kale, +10 moreStart indoors: Broccoli, Tuscan kale, Cucumber, +10 moreTransplants: Broccoli, Tuscan kale, Onion, +5 moretmin 15.37 C tmax 27.13 C rain 37.41 mm dry 13.17 days Direct sowing: Swiss chard, Carrot, Tuscan kale, +13 moreStart indoors: Broccoli, Tuscan kale, Cucumber, +10 moreTransplants: Broccoli, Tuscan kale, Cucumber, +11 moretmin 18.16 C tmax 30.71 C rain 24.12 mm dry 15.7 days Direct sowing: Swiss chard, Carrot, Tuscan kale, +13 moreStart indoors: Broccoli, Tuscan kale, Cucumber, +8 moreTransplants: Broccoli, Tuscan kale, Cucumber, +11 moretmin 18.79 C tmax 31.18 C rain 27.68 mm dry 15.73 days Direct sowing: Swiss chard, Carrot, Tuscan kale, +13 moreStart indoors: Tuscan kale, Cucumber, Fennel, +3 moreTransplants: Broccoli, Tuscan kale, Cucumber, +11 moretmin 14.89 C tmax 25.8 C rain 76.38 mm dry 9.97 days Direct sowing: Garlic, Swiss chard, Carrot, +11 moreStart indoors: LettuceTransplants: Broccoli, Tuscan kale, Cucumber, +7 moretmin 11.25 C tmax 20.77 C rain 86.25 mm dry 10.47 days Direct sowing: Garlic, Lettuce, Radish, +2 moreStart indoors: -Transplants: Lettucetmin 7.18 C tmax 15.04 C rain 106.53 mm dry 8.6 days Direct sowing: GarlicStart indoors: -Transplants: -tmin 3.39 C tmax 10.85 C rain 78.28 mm dry 9.83 days Direct sowing: GarlicStart indoors: -Transplants: -Most flexible crops Recommended windows: March, April, May, June, July, August, SeptemberMethod: direct sowing, transplantingBest estimated success rate: 83%Data reliability: 0.83Recommended windows: April, May, June, July, August, September, OctoberMethod: direct sowing, transplantingBest estimated success rate: 80%Data reliability: 0.8Recommended windows: April, May, June, July, August, September, OctoberMethod: direct sowingBest estimated success rate: 87%Data reliability: 0.8Recommended windows: April, May, June, July, August, September, OctoberMethod: direct sowingBest estimated success rate: 87%Data reliability: 0.8Crops to manage carefully Swiss chard Watch-out: frost risk medium, heat risk high, dry-spell risk high, main limit: frostRecommended windows: April, May, June, July, August, SeptemberHow reliable the window is: recommended windowData reliability: 0.8Broccoli Watch-out: frost risk medium, heat risk high, dry-spell risk high, main limit: frostRecommended windows: April, May, June, July, August, SeptemberHow reliable the window is: recommended windowData reliability: 0.8Carrot Watch-out: frost risk medium, heat risk high, dry-spell risk high, main limit: frostRecommended windows: April, May, June, July, August, SeptemberHow reliable the window is: recommended windowData reliability: 0.8Tuscan kale Watch-out: frost risk medium, heat risk high, dry-spell risk high, main limit: frostRecommended windows: April, May, June, July, August, SeptemberHow reliable the window is: recommended windowData reliability: 0.8Heat and dry spell notes Local note Heat: on average, 50.4 days per year exceed 30C. Intense heat: on average, 5.73 days per year exceed 35C. Summer dry spells: the longest dry phase in summer averages 20.37 days. Method Start from local dates Use the dates for Viterbo as practical guidance, then adjust for exposure, elevation, and shelter in your garden.
Check cold, heat, and dry spells Before sowing or transplanting, check frost, cold nights, heat waves, and periods without rain.
Respect crop needs Each crop needs warm enough soil, frost protection, and a different amount of time to reach harvest.
Choose the safest window Use recommended windows as the main reference; move earlier or later only when weather and microclimate help.
Sources and limits Use these dates as practical guidance, not fixed deadlines. Exposure, soil, containers, irrigation, and the next few days' forecast can move the right timing earlier or later.
Municipality registry: ISTAT Local historical climate: NASA POWER Daily API Representative weather point: GeoNames Crop needs: OrtoClima Last data update: May 10, 2026 Related pages
