Your biggest vulnerability, in a SHTF situation where you are living at your homestead and need to grow your own crops and manage your own livestock so as to maintain a viable lifestyle for you and your family for many years to come, will be when you’re out in the field and focused on your farming duties.
Maintaining any type of effective security of your homestead retreat will require more manpower than you could afford to spare during harvest time, and even if you could, you’d remain vulnerable to a skilled and determined adversary. A better strategy is to create a buffer zone between the land you work and the uncontrolled land adjacent to you. This buffer zone reduces the lethality of any surprise assault and gives you time to get to shelter or a defensible position, or regroup and defend your homestead retreat.
A sufficient sized buffer zone requires an enormous amount of additional land, we suggest you either rent out some of your buffer zone or settle next to other like-minded folk, giving you relatively safe and more secure boundaries on at least some sides of your retreat lot.