Last frost date in Newton, MA
Expect the last frost in Newton around April 19. Frost after May 3 happens in only one year out of ten. The first fall frost usually arrives about October 23, which leaves 185 frost-free days. An early freeze before October 8 happens one year in ten.
- Safe after (10% risk)
- May 3
- Average first frost
- Oct 23
- Frost-free season
- 185 days
- Hard freeze (28°F) ends
- Apr 5
Frost likely Fri night, low 31°F
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2238°
- FriOct 2331°frost
- SatOct 2433°possible frost
- SunOct 2537°
- MonOct 2644°
- TueOct 2739°
- WedOct 2841°
Planting calendar for Newton
Windows count forward or back from the average frost dates above. Click a crop for dates across Massachusetts.
TomatoesApr 26–May 10
PumpkinsMay 3–May 17
SunflowersApr 19–May 10
CucumbersMay 3–May 10
CornApr 26–May 10
Sweet potatoesMay 10–May 24
WatermelonMay 3–May 17
Green beansApr 26–May 17
ZucchiniApr 26–May 10
OkraMay 10–May 24
PeppersMay 3–May 17
BasilApr 26–May 10
Butternut squashApr 26–May 10
CantaloupeMay 3–May 17
EggplantMay 3–May 17
PotatoesMar 22–Apr 5
OnionsMar 8–Mar 29
CarrotsMar 29–May 3
LettuceApr 5–Apr 26
BroccoliMar 22–Apr 5
BeetsMar 22–May 3
PeasMar 8–Mar 22
CabbageMar 22–Apr 5
RadishesMar 15–Apr 26
Brussels sproutsApr 5–Apr 19
SpinachMar 8–Mar 29
CilantroApr 5–Apr 26
KaleMar 22–Apr 5
Collard greensMar 22–Apr 5
TurnipsMar 22–Apr 5
DillApr 19–May 3
CeleryApr 26–May 3
CauliflowerApr 5–Apr 19
LeeksApr 5–Apr 19
Swiss chardApr 5–May 3
ParsleyApr 5–Apr 26
Tulip bulbsOct 9–Nov 13
GarlicOct 2–Nov 6
Daffodil bulbsSep 25–Nov 6
StrawberriesMar 22–Apr 5
AsparagusMar 22–Apr 5Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Apr 6 | Apr 19 | May 3 | Oct 8 | Oct 23 | Nov 5 |
| Hard freeze, 28°F | Mar 25 | Apr 5 | Apr 21 | Oct 19 | Nov 3 | Nov 19 |
Read the spring 10% column as the date after which only one year in ten still gets frost. That is the safer date for tomatoes, peppers and basil.
Where these numbers come from
NOAA station Jamaica Plain (USC00193890) sits 4.7 miles from the center of Newton at 95 feet. Its averages cover 1991 to 2020. Low spots, valleys and open fields can keep getting frost a week or two after the station stops; city centers and lakeshores usually get less of it.
Questions
When is the last frost in Newton, MA?
The average last frost date in Newton is April 19, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 3.
When is the first frost in Newton?
The first frost in fall usually comes around October 23. One year in ten it arrives before October 8.
How long is the growing season in Newton?
About 185 days between the average last and first frost.
When should I plant tomatoes in Newton?
Plant tomato seedlings outside from April 26 to May 10. Start seeds indoors six to eight weeks earlier.