A Division of Weston Nurseries, Inc.

Create a Seed Starting Calendar



Now is the time to start planning your vegetable garden by making a schedule for your indoor seed starting. Some seeds such as peas, beans, corn, radishes, carrots, and beets should be directly sown outside but many others, such as tomatoes, peppers and eggplant can be started indoors. One of the best sources of information about starting seeds indoors can be found right on the seed packet. You will find information on the label about days to germination and harvest, depth to plant, optimal soil temperature for germination, seed spacing, and how many weeks before the last frost to start indoors. Some seeds such as peas, beans, corn, radishes, carrots, and beets should be directly sown outside.

You may need to adjust your schedule slightly depending on your indoor growing conditions. If the air and soil temperatures are below 70, then seeds will take longer to germinate and seedlings will grow more slowly. Conversely, if temperatures are above 70, seeds will germinate faster and seedlings will grow more quickly.

Although you may be dreaming of springtime and fired up to get your seeds going, don’t be too hasty. Seedlings that spend too much time indoors may end up weak and spindly.  Instead of rushing to sow, get out your seed packets and make a seed starting calendar! 

According to The Farmer’s Almanac, the dates given below are the best time to start seeds indoors and then to transplant young plants outside, based on an average last spring frost occurring on May 6. Frost dates are based on 30-year rolling averages, so they are only a guide of what is “typical.” Every year can be different.

Also, every garden can have what we call “microclimates” (e.g., an area in the dip of a valley or on the slope of a mountain) which differ. You’ll need to use your best judgment and this guide as a good starting place. Remember, all seedlings grown indoors will need to be “hardened off” prior to planting outside. Over time, you’ll gain experience and learn what works best in your garden!

CropStart Seeds IndoorsPlant Seedlings Outdoors
BasilMarch 10-25May 6-27
Bell PeppersFeb. 24-March 10May 13-27
BroccoliMarch 10-25April 8-29
Brussel SproutsMarch 10-25April 8-22
CabbageMarch 10-25April 8-22
CantaloupesApril 8-15May 20-June 3
CauliflowerMarch 10-25April 8-29
CeleryFeb. 24-March 10May 13-27
CucumbersApril 8-15May 20-June 3
EggplantsFeb. 24-March 10May 20-June 3
KaleMarch 10-25April 8-29
KohlrabiMarch 25- April 8April 15-22
LettuceMarch 25-April 8April 22-May 20
OreganoFeb. 24-March 25May 6-27
PumpkinsApril 15-29May 20-June 3
RosemaryFeb. 24-March 10May 13-June 3
SageMarch 10-25May 6-20
Summer SquashApril 8-22May 20-June 3
Swiss ChardMarch 25-April 8April 15-22
ThymeFe. 24-March 25May 6-27
TomatoesMarch 10-25May 13-June 3
WatermelonsApril 8-15May 20-June 3

From The Old Farmer’s Almanac

Share this post

Plant Notes

Fall Plants for Bees

Bring in the Bees!   Every plant that requires an insect pollinator will have devised strategies to attract the type of pollinator it needs, but some plants draw a real profusion

Read More »
Plant Notes

Shrubs To Brighten Fall Days

Fall brings an explosion of color to New England’s landscapes with vibrant foliage in hues of yellow, orange and red, along with bright berries in a wide array of colors

Read More »
Plant Notes

Perennials for July Color

By the time July comes around summer is in full swing, and the choice of perennials that could be highlighted is large, so to compile a short list means I

Read More »

Pollinator’s Word

June is pollinator month in Massachusetts and the third week in June is also National Pollinator Week.  Making a space that is pollinator friendly can involve planting a variety of

Read More »
Plant Notes

Spring Lawn Care 101

Lawns tend to play a supporting role in our outdoor spaces, framing the big showstoppers like blooming trees and colorful flowers. But turf is still an important part of a

Read More »
Plant Notes

Women Horticulturists

By Catherine Cooper While many famous names in horticulture belong to men, throughout the centuries there have been many women who have made notable contributions to the various fields of

Read More »