When to plant in Mason, NH
Planting dates worked out from Mason's own frost records, not a generic zone chart.
Safe to plant out
May 20
1 year in 10 has a later frost
Average last frost
May 11
about a 50% chance of a later one
Average first fall frost
Oct 4
1 year in 10 by Sep 23
Frost-free days
142
median, 1991–2020
Station used: Milford · 14.5 km away · station 98 m, town 228 m. How we match towns to stations
This season
Plan your garden.
Planting dates for common crops
| Crop | Start indoors | Plant out or sow | Harvest from |
|---|---|---|---|
| Tomato | Mar 25 – Apr 8 | May 20 – Jun 3 | Jul 14 |
| Sweet pepper | Mar 11 – Mar 25 | May 20 – Jun 3 | Jul 19 |
| Lettuce (leaf) | Mar 9 – Mar 16 | Apr 13 – Apr 27 | May 23 |
| Peas | — | Apr 7 – May 5 | Jun 1 |
| Bush beans | — | May 13 – Jun 3 | Jul 2 |
| Carrot | — | Apr 20 – Jun 1 | Jun 19 |
| Beet | — | Apr 17 – May 29 | Jun 6 |
| Potato | — | Apr 20 – May 11 | Jun 29 |
| Kale | Mar 3 – Mar 17 | Apr 14 – Apr 28 | May 27 |
| Broccoli | Mar 2 – Mar 16 | Apr 13 – May 4 | Jun 12 |
| Cucumber | Apr 22 – Apr 29 | May 20 – Jun 3 | Jul 9 |
| Summer squash and zucchini | Apr 22 – Apr 29 | May 20 – Jun 3 | Jul 4 |
| Winter squash | Apr 22 – Apr 29 | May 20 – Jun 3 | Aug 8 |
| Sweet corn | — | May 13 – Jun 3 | Jul 12 |
| Onion (from sets) | — | Apr 13 – May 4 | Jul 12 |
| Garlic | — | Sep 20 – Oct 18 (fall) | following summer |
| Spinach | — | Apr 7 – May 5 | May 15 |
| Basil | Apr 8 – Apr 22 | May 20 – Jun 3 | Jul 16 |
Mason's weather over time
How the growing season has shifted here, year by year, from the station's own records.
Each year's last spring frostLong-term trend
See the data as a table
| Year | Last spring frost |
|---|---|
| 1992 | May 12 |
| 1993 | Apr 30 |
| 1994 | May 28 |
| 1995 | May 2 |
| 1996 | May 15 |
| 1997 | May 5 |
| 1998 | May 14 |
| 1999 | May 14 |
| 2000 | May 20 |
| 2001 | May 8 |
| 2002 | May 20 |
| 2003 | May 4 |
| 2004 | May 6 |
| 2005 | May 13 |
| 2007 | May 7 |
Each year's frost-free daysLong-term trend
See the data as a table
| Year | Frost-free days |
|---|---|
| 1992 | 134 |
| 1993 | 142 |
| 1994 | 136 |
| 1995 | 149 |
| 1996 | 141 |
| 1997 | 139 |
| 1998 | 132 |
| 1999 | 144 |
| 2000 | 129 |
| 2001 | 153 |
| 2002 | 141 |
| 2003 | 152 |
| 2004 | 152 |
| 2005 | 160 |
| 2007 | 162 |
Each year's average temperature, April to SeptemberLong-term trend
See the data as a table
| Year | Growing-season temperature |
|---|---|
| 1992 | 15.6 °C |
| 1993 | 16.9 °C |
| 1994 | 17.1 °C |
| 1995 | 16.4 °C |
| 1996 | 16.4 °C |
| 1997 | 15.7 °C |
| 1998 | 16.6 °C |
| 1999 | 16.6 °C |
| 2000 | 14.7 °C |
| 2001 | 16.9 °C |
| 2002 | 16.8 °C |
| 2003 | 16.1 °C |
| 2004 | 16.1 °C |
| 2005 | 16.9 °C |
| 2007 | 16.2 °C |
What this means for you: This station's record is too short to show a reliable trend yet.
Source: daily records from Milford (NOAA GHCN-Daily). Years with too many missing days are left out.