Last frost date in Arnold, MD
Expect the last frost in Arnold around March 27. Frost after April 9 happens in only one year out of ten. The first fall frost usually arrives about November 13, which leaves 234 frost-free days. An early freeze before November 1 happens one year in ten.
- Safe after (10% risk)
- Apr 9
- Average first frost
- Nov 13
- Frost-free season
- 234 days
- Hard freeze (28°F) ends
- Mar 14
No frost in the next 7 nights
National Weather Service forecast, updated Oct 22, 12:24 UTC
- ThuOct 2246°
- FriOct 2340°
- SatOct 2441°
- SunOct 2543°
- MonOct 2648°
- TueOct 2749°
- WedOct 2849°
Planting calendar for Arnold
Windows count forward or back from the average frost dates above. Click a crop for dates across Maryland.
TomatoesApr 3–Apr 17
PumpkinsApr 10–Apr 24
SunflowersMar 27–Apr 17
CucumbersApr 10–Apr 17
CornApr 3–Apr 17
Sweet potatoesApr 17–May 1
WatermelonApr 10–Apr 24
Green beansApr 3–Apr 24
ZucchiniApr 3–Apr 17
OkraApr 17–May 1
PeppersApr 10–Apr 24
BasilApr 3–Apr 17
Butternut squashApr 3–Apr 17
CantaloupeApr 10–Apr 24
EggplantApr 10–Apr 24
PotatoesFeb 27–Mar 13
OnionsFeb 13–Mar 6
CarrotsMar 6–Apr 10
LettuceMar 13–Apr 3
BroccoliFeb 27–Mar 13
BeetsFeb 27–Apr 10
PeasFeb 13–Feb 27
CabbageFeb 27–Mar 13
RadishesFeb 20–Apr 3
Brussels sproutsMar 13–Mar 27
SpinachFeb 13–Mar 6
CilantroMar 13–Apr 3
KaleFeb 27–Mar 13
Collard greensFeb 27–Mar 13
TurnipsFeb 27–Mar 13
DillMar 27–Apr 10
CeleryApr 3–Apr 10
CauliflowerMar 13–Mar 27
LeeksMar 13–Mar 27
Swiss chardMar 13–Apr 10
ParsleyMar 13–Apr 3
Tulip bulbsOct 30–Dec 4
GarlicOct 23–Nov 27
Daffodil bulbsOct 16–Nov 27
StrawberriesFeb 27–Mar 13
AsparagusFeb 27–Mar 13Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Mar 9 | Mar 27 | Apr 9 | Nov 1 | Nov 13 | Dec 1 |
| Hard freeze, 28°F | Feb 26 | Mar 14 | Mar 29 | Nov 9 | Nov 28 | Dec 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 Annapolis Police Brks (USC00180193) sits 3.4 miles from the center of Arnold at 25 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 Arnold, MD?
The average last frost date in Arnold is March 27, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 9.
When is the first frost in Arnold?
The first frost in fall usually comes around November 13. One year in ten it arrives before November 1.
How long is the growing season in Arnold?
About 234 days between the average last and first frost.
When should I plant tomatoes in Arnold?
Plant tomato seedlings outside from April 3 to April 17. Start seeds indoors six to eight weeks earlier.