Frost risk
Last frost in Siena
Median last frost, cautious frost date, and guidance on sowing before or after cold risk in Siena.
Median 0 °C
March 26springCautious 2 °C
April 19springAutumn 2 °C
October 29first frostWhat 0 °C and 2 °C mean
Reference dates
When spring frosts usually fall
- March 260C median
- April 40C cautious
- April 82C median
- April 192C cautious
| indicator | date |
|---|---|
| Median last frost 0 °C | March 26 |
| Cautious last frost 0 °C | April 4 |
| Median last frost 2 °C | April 8 |
| Cautious last frost 2 °C | April 19 |
| Cautious first autumn frost 0 °C | November 14 |
| Cautious first autumn frost 2 °C | October 29 |
Last 10 available years
The table shows, for each available year, the last date between January and June when the daily minimum was at or below 0 °C.
| year | last date <= 0 °C | minimum |
|---|---|---|
| 2020 | April 2 | -3.29 °C |
| 2019 | March 14 | -0.02 °C |
| 2018 | March 26 | -1.39 °C |
| 2017 | February 26 | -0.73 °C |
| 2016 | March 4 | -1.31 °C |
| 2015 | April 8 | -0.37 °C |
| 2014 | March 12 | -0.16 °C |
| 2013 | March 27 | -1.38 °C |
| 2012 | April 9 | -1.04 °C |
| 2011 | March 21 | -0.75 °C |
Frequently asked questions
What is the cautious garden date for Siena?
The most cautious date on this page is April 19 on the 2 °C threshold. For sensitive crops, use it as the reference before moving sowing or transplanting earlier.
When should I use the 0 °C date and the 2 °C date?
The median 0 °C date is March 26, while the cautious 2 °C date is April 19. The 2 °C threshold is more cautious for cold nights, inversions, and exposed spots.
How should I adapt the frost date inside Siena?
No. In Siena, exposure, elevation, wind, and soil can move real risk earlier or later than the representative municipality point.