Last frost date in Rosemount, MN

Average last frost

May 2

The average last frost in Rosemount is May 2. By May 16 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about October 5, which leaves 155 frost-free days. An early freeze before September 22 happens one year in ten.

Safe after (10% risk): May 16
Average first frost: Oct 5
Frost-free season: 155 days
Hard freeze (28°F) ends: Apr 22

Next 7 nights in Rosemount

No frost in the next 7 nights

Later than usual: the average first frost here is October 5.

National Weather Service forecast, updated Oct 22, 12:24 UTC

ThuOct 2254°
FriOct 2359°
SatOct 2449°
SunOct 2543°
MonOct 2639°
TueOct 2740°
WedOct 2841°

Frost risk through the year at Rosemount Rsch & Outreach Center, 2.5 miles from Rosemount.

Planting calendar for Rosemount

Windows count forward or back from the average frost dates above. Click a crop for dates across Minnesota.

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost

Warm-season crops

JanFebMarAprMayJunJulAugSepOctNovDec

TomatoesMay 9–May 23

PumpkinsMay 16–May 30

SunflowersMay 2–May 23

CucumbersMay 16–May 23

CornMay 9–May 23

Sweet potatoesMay 23–Jun 6

WatermelonMay 16–May 30

Green beansMay 9–May 30

ZucchiniMay 9–May 23

OkraMay 23–Jun 6

PeppersMay 16–May 30

BasilMay 9–May 23

Butternut squashMay 9–May 23

CantaloupeMay 16–May 30

EggplantMay 16–May 30

Cool-season crops

JanFebMarAprMayJunJulAugSepOctNovDec

PotatoesApr 4–Apr 18

OnionsMar 21–Apr 11

CarrotsApr 11–May 16

LettuceApr 18–May 9

BroccoliApr 4–Apr 18

BeetsApr 4–May 16

PeasMar 21–Apr 4

CabbageApr 4–Apr 18

RadishesMar 28–May 9

Brussels sproutsApr 18–May 2

SpinachMar 21–Apr 11

CilantroApr 18–May 9

KaleApr 4–Apr 18

Collard greensApr 4–Apr 18

TurnipsApr 4–Apr 18

DillMay 2–May 16

CeleryMay 9–May 16

CauliflowerApr 18–May 2

LeeksApr 18–May 2

Swiss chardApr 18–May 16

ParsleyApr 18–May 9

Fall bulbs and garlic

JanFebMarAprMayJunJulAugSepOctNovDec

Tulip bulbsSep 21–Oct 26

GarlicSep 14–Oct 19

Daffodil bulbsSep 7–Oct 19

Perennials

JanFebMarAprMayJunJulAugSepOctNovDec

StrawberriesApr 4–Apr 18

AsparagusApr 4–Apr 18

Frost probabilities

Threshold	Spring, 90% chance later	Spring, 50%	Spring, 10%	Fall, 10% chance earlier	Fall, 50%	Fall, 90%
Light frost, 32°F	Apr 19	May 2	May 16	Sep 22	Oct 5	Oct 19
Hard freeze, 28°F	Apr 8	Apr 22	May 7	Oct 2	Oct 17	Oct 31

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 Rosemount Rsch & Outreach Center (USC00217107) sits 2.5 miles from the center of Rosemount at 945 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 Rosemount, MN?

The average last frost date in Rosemount is May 2, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 16.

When is the first frost in Rosemount?

The first frost in fall usually comes around October 5. One year in ten it arrives before September 22.

How long is the growing season in Rosemount?

About 155 days between the average last and first frost.

When should I plant tomatoes in Rosemount?

Plant tomato seedlings outside from May 9 to May 23. Start seeds indoors six to eight weeks earlier.

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